SHELLS.

Mollusca.—Radiata, &c.

Ceylon has long been renowned for the beauty and variety of the shells which abound in its seas and inland waters, and in which an active trade has been organised by the industrious Moors, who clean them with great expertness, arrange them in satin-wood boxes, and send them to Colombo and all parts of the island for sale. In general, however, these specimens are more prized for their beauty than valued for their rarity, though some of the "Argus" cowries[3691] have been sold as high as four guineas a pair.

One of the principal sources whence their supplies are derived is the beautiful Bay of Venloos, to the north of Batticaloa, formed by the embouchure of the Natoor river. The scenery at this spot is enchanting. The sea is overhung by gentle acclivities wooded to the summit; and in an opening between two of these eminences the river flows through a cluster of little islands covered with mangroves and acacias. A bar of rocks projects across it, at a short distance from the shore; and these are frequented all day long by pelicans, that come at sunrise to fish, and at evening return to their solitary breeding-places remote from the beach. The strand is literally covered with beautiful shells in rich profusion, and the dealers from Trincomalie know the proper season to visit the bay for each particular description. The entire coast, however, as far north as the Elephant Pass, is indented by little rocky inlets, where shells of endless variety may be collected in great abundance.[3701] During the north-east monsoon a formidable surf bursts upon the shore, which is here piled high with mounds of yellow sand; and the remains of shells upon the water mark show how rich the sea is in mollusca. Amongst them are prodigious numbers of the ubiquitous violet-coloured Ianthina[3702], which rises when the ocean is calm, and by means of its inflated vesicles floats lightly on the surface.

The trade in shells is one of extreme antiquity in Ceylon. The Gulf of Manaar has been fished from the earliest times for the large chank shell, Turbinella rapa, to be exported to India, where it is still sawn into rings and worn as anklets and bracelets by the women of Hindustan. Another use for these shells is their conversion into wind instruments, which are sounded in the temples on all occasions of ceremony. A chank, in which the whorls, instead of running from left to right, as in the ordinary shell, are reversed, and run from right to left, is regarded with such reverence that a specimen formerly sold for its weight in gold, but one may now be had for four or five pounds. COSMAS INDICO-PLEUSTES, writing in the fifth century, describes a place on the west coast of Ceylon, which he calls Marallo, and says it produced "[Greek: kochlious]," which THEVENOT translates "oysters;" in which case Marallo might be conjectured to be Bentotte, near Colombo, which yields the best edible "oysters" in Ceylon.[3711] But the shell in question was most probably the chank, and Marallo was Mantotte, off which it is found in great numbers.[3712] In fact, two centuries later Abouzeyd, an Arab, who wrote an account of the trade and productions of India, speaks of these shells by the name they still bear, which he states to be schenek[3713]; but "schenek" is not an Arabic word, and is merely an attempt to spell the local term, chank, in Arabic characters.

BERTOLACCI mentions a curious local peculiarity[3721] observed by the fishermen in the natural history of the chank. "All shells," he says, "found to the northward of a line drawn from a point about midway from Manaar to the opposite coast (of India) are of the kind called patty, and are distinguished by a short flat head; and all those found to the southward of that line are of the kind called pajel, and are known from having a longer and more pointed head than the former. Nor is there ever an instance of deviation from this singular law of nature. The Wallampory, or 'right-hand chanks,' are found of both kinds."

This tendency of particular localities to re-produce certain specialities of form and colour is not confined to the sea or to the instance of the chank shell. In the gardens which line the suburbs of Galle in the direction of Matura the stems of the coco-nut and jak trees are profusely covered with the shells of the beautiful striped Helix hamastoma. Stopping frequently to collect them, I was led to observe that each separate garden seemed to possess a variety almost peculiar to itself; in one the mouth of every individual shell was red; in another, separated from the first only by a wall, black; and in others (but less frequently) pure white; whilst the varieties of external colouring were equally local. In one enclosure they were nearly all red, and in an adjoining one brown.[3722]

A trade more ancient by far than that carried on in chanks, and infinitely more renowned, is the fishery of pearls on the west coast of Ceylon, bordering the Gulf of Manaar. No scene in Ceylon presents so dreary an aspect as the long sweep of desolate shore to which, from time immemorial, adventurers have resorted from the uttermost ends of the earth in search of the precious pearls for which this gulf is renowned. On approaching it from sea the only perceptible landmark is a building erected by Lord Guildford, as a temporary residence for the Governor, and known by the name of the "Doric," from the style of its architecture. A few coco-nut palms appear next above the low sandy beach, and presently are discovered the scattered houses which form the villages of Aripo and Condatchy.

Between these two places, or rather between the Kalaar and Arrive river, the shore is raised to a height of many feet, by enormous mounds of shells, the accumulations of ages, the millions of oysters[3731], robbed of their pearls, having been year after year flung into heaps, that extend for a distance of many miles.

During the progress of a pearl-fishery, this singular and dreary expanse becomes suddenly enlivened by the crowds who congregate from distant parts of India; a town is improvised by the construction of temporary dwellings, huts of timber and cajans[3732], with tents of palm leaves or canvas; and bazaars spring up, to feed the multitude on land, as well as the seamen and divers in the fleets of boats that cover the bay.

I visited the pearl banks officially in 1848 in company with Capt. Stenart, the official inspector. My immediate object was to inquire into the causes of the suspension of the fisheries, and to ascertain the probability of reviving a source of revenue, the gross receipts from which had failed for several years to defray the cost of conservancy. In fact, between 1837 and 1854, the pearl banks were an annual charge, instead of producing an annual income, to the colony. The conjecture, hastily adopted, to account for the disappearance of mature shells, had reference to mechanical causes; the received hypothesis being that the young broods had been swept off their accustomed feeding grounds, by the establishment of unusual currents, occasioned by deepening the narrow passage between Ceylon and India at Paumbam. It was also suggested, that a previous Governor, in his eagerness to replenish the colonial treasury, had so "scraped" and impoverished the beds as to exterminate the oysters. To me, neither of these suppositions appeared worthy of acceptance; for, in the frequent disruptions of Adam's Bridge, there was ample evidence that the currents in the Gulf of Manaar had been changed at former times without destroying the pearl beds: and moreover the oysters had disappeared on many former occasions, without any imputation of improper management on the part of the conservators; and returned after much longer intervals of absence than that which fell under my own notice, and which was then creating serious apprehension in the colony.

A similar interruption had been experienced between 1820 and 1828: the Dutch had had no fishing for twenty-seven years, from 1768 till 1796[3751]; and they had been equally unsuccessful from 1732 till 1746. The Arabs were well acquainted with similar vicissitudes, and Albyronni (a contemporary of Avicenna), who served under Mahmoud of Ghuznee, and wrote in the eleventh century, says that the pearl fishery, which formerly existed in the Gulf of Serendib, had become exhausted in his time, simultaneously with the appearance of a fishery at Sofala, in the country of the Zends, where pearls were unknown before; and hence, he says, arose the conjecture that the pearl oyster of Serendib had migrated to Sofala.[3752]

It appeared to me that the explanation of the phenomenon was to be sought, not merely in external causes, but also in the instincts and faculties of the animals themselves, and, on my return to Colombo, I ventured to renew a recommendation, which had been made years before, that a scientific inspector should be appointed to study the habits and the natural history of the pearl-oyster, and that his investigations should be facilitated by the means at the disposal of the Government.

Dr. Kelaart was appointed to this office, by Sir H.G. Ward, in 1857, and his researches speedily developed results of great interest. In opposition to the received opinion that the pearl-oyster is incapable of voluntary movement, and unable of itself to quit the place to which it is originally attached[3761], he demonstrated, not only that it possesses locomotive powers, but also that their exercise is indispensable to its oeconomy when obliged to search for food, or compelled to escape from local impurities. He showed that, for this purpose, it can sever its byssus, and re-form it at pleasure, so as to migrate and moor itself in favourable situations.[3762] The establishment of this important fact may tend to solve the mystery of the occasional disappearances of the oyster; and if coupled with the further discovery that it is susceptible of translation from place to place, and even from salt to brackish water, it seems reasonable to expect that beds may be formed with advantage in positions suitable for its growth and protection. Thus, like the edible oyster of our own shores, the pearl-oyster may be brought within the domain of pisciculture, and banks may be created in suitable places, just as the southern shores of France are now being colonised with oysters, under the direction of M. Coste.[3763] The operation of sowing the sea with pearl, should the experiment succeed, would be as gorgeous in reality, as it is grand in conception: and the wealth of Ceylon, in her "treasures of the deep," might eclipse the renown of her gems when she merited the title of the "Island of Rubies."

On my arrival at Aripo, the pearl-divers, under the orders of their Adapanaar, put to sea, and commenced the examination of the banks.[3771] The persons engaged in this calling are chiefly Tamils and Moors, who are trained for the service by diving for chanks. The pieces of apparatus employed to assist the diver in his operations are exceedingly simple in their character: they consist merely of a stone, about thirty pounds' weight, (to accelerate the rapidity of his descent,) which is suspended over the side of the boat, with a loop attached to it for receiving the foot; and of a net-work basket, which he takes down to the bottom and fills with the oysters as he collects them. MASSOUDI, one of the earliest Arabian geographers, describing, in the ninth century, the habits of the pearl-divers in the Persian Gulf, says that, before descending, each filled his ears with cotton steeped in oil, and compressed his nostrils by a piece of tortoise-shell.[3772] This practice continues there to the present day[3773]; but the diver of Ceylon rejects all such expedients; he inserts his foot in the "sinking stone" and inhales a full breath; presses his nostrils with his left hand; raises his body as high as possible above water, to give force to his descent: and, liberating the stone from its fastenings, he sinks rapidly below the surface. As soon as he has reached the bottom, the stone is drawn up, and the diver, throwing himself on his face, commences with alacrity to fill his basket with oysters. This, on a concerted signal, is hauled rapidly to the surface; the diver assisting his own ascent by springing on the rope as it rises.

Improbable tales have been told of the capacity which these men acquire of remaining for prolonged periods under water. The divers who attended on this occasion were amongst the most expert on the coast, yet not one of them was able to complete a full minute below. Captain Steuart, who filled for many years the office of Inspector of the Pearl Banks, assured me that he had never known a diver to continue at the bottom longer than eighty-seven seconds, nor to attain a greater depth than thirteen fathoms; and on ordinary occasions they seldom exceeded fifty-five seconds in nine fathom water[3781].

The only precaution to which the Ceylon diver devotedly resorts, is the mystic ceremony of the shark-charmer, whose exorcism is an indispensable preliminary to every fishery. His power is believed to be hereditary; nor is it supposed that the value of his incantations is at all dependent upon the religious faith professed by the operator, for the present head of the family happens to be a Roman Catholic. At the time of our visit this mysterious functionary was ill and unable to attend; but he sent an accredited substitute, who assured me that although he himself was ignorant of the grand and mystic secret, the mere fact of his presence, as a representative of the higher authority, would be recognised and respected by the sharks.

Strange to say, though the Gulf of Manaar abounds with these hideous creatures, not more than one well authenticated accident[3791] is known to have occurred from this source during any pearl fishery since the British have had possession of Ceylon. In all probability the reason is that the sharks are alarmed by the unusual number of boats, the multitude of divers, the noise of the crews, the incessant plunging of the sinking stones, and the descent and ascent of the baskets filled with shells. The dark colour of the divers themselves may also be a protection; whiter skins might not experience an equal impunity. Massoudi relates that the divers of the Persian Gulf were so conscious of this advantage of colour, that they were accustomed to blacken their limbs, in order to baffle the sea monsters.[3792]

The result of our examination of the pearl banks, on this occasion, was such as to discourage the hope of an early fishery. The oysters in point of number were abundant, but in size they were little more than "spat," the largest being barely a fourth of an inch in diameter. As at least seven years are required to furnish the growth at which pearls may be sought with advantage[3793], the inspection served only to suggest the prospect (which has since been realised) that in time the income from this source might be expected to revive;—and, forced to content ourselves with this anticipation, we weighed anchor from Condatchy, on the 30th March, and arrived on the following day at Colombo.

The banks of Aripo are not the only localities, nor is the acicula the only mollusc, by which pearls are furnished. The Bay of Tamblegam, connected with the magnificent harbour of Trincomalie, is the seat of another pearl fishery, and the shell which produces them is the thin transparent oyster (Placuna placenta). whose clear white shells are used, in China and elsewhere, as a substitute for window glass. They are also collected annually for the sake of the diminutive pearls contained in them. These are exported to the coast of India, to be calcined for lime, which the luxurious affect to chew with their betel. These pearls are also burned in the mouths of the dead. So prolific are the mollusca of the Placuna, that the quantity of shells taken by the licensed renter in the three years prior to 1858, could not have been less than eighteen millions.[3801] They delight in brackish water, and on more than one recent occasion, an excess of either salt water or fresh has proved fatal to great numbers of them.

PEARL OYSTER.

1, 2. The young brood or spat.

3. Four months old.

4. Six months old.

5. One year old.

6. Two years old.

On the occasion of a visit which I made to Batticaloa. in September, 1848, I made some inquiries relative to a story which had reached me of musical sounds, said to be often heard issuing from the bottom of the lake, at several places, both above and below the ferry opposite the old Dutch Fort; and which the natives suppose to proceed from some fish peculiar to the locality. The report was confirmed in all its particulars, and one of the spots whence the sounds proceed was pointed out between the pier and a rock that intersects the channel, two or three hundred yards to the eastward. They were said to be heard at night, and most distinctly when the moon was nearest the full, and they were described as resembling the faint sweet notes of an Æolian harp. I sent for some of the fishermen, who said they were perfectly aware of the fact, and that their fathers had always known of the existence of the musical sounds, heard, they said, at the spot alluded to, but only during the dry season, as they cease when the lake is swollen by the freshes after the rain. They believed them to proceed not from a fish, but from a shell, which is known by the Tamil name of (oorie cooleeroo cradoo, or) the "crying shell," a name in which the sound seems to have been adopted as an echo to the sense. I sent them in search of the shell, and they returned bringing me some living specimens of different shells, chiefly littorina and cerithium.[3811]

In the evening when the moon rose, I took a boat and accompanied the fishermen to the spot. We rowed about two hundred yards north-east of the jetty by the fort gate; there was not a breath of wind, nor a ripple except those caused by the dip of our oars. On coming to the point mentioned, I distinctly heard the sounds in question. They came up from the water like the gentle thrills of a musical chord, or the faint vibrations of a wine-glass when its rim is rubbed by a moistened finger. It was not one sustained note, but a multitude of tiny, sounds, each clear and distinct in itself; the sweetest treble mingling with the lowest bass. On applying the ear to the woodwork of the boat, the vibration was greatly increased in volume. The sounds varied considerably at different points, as we moved across the lake, as if the number of the animals from which they proceeded was greatest in particular spots; and occasionally we rowed out of hearing of them altogether, until on returning to the original locality the sounds were at once renewed.

This fact seems to indicate that the causes of the sounds, whatever they may be, are stationary at several points; and this agrees with the statement of the natives, that they are produced by mollusca, and not by fish. They came evidently and sensibly from the depth of the lake, and there was nothing in the surrounding circumstances to support the conjecture that they could be the reverberation of noises made by insects on the shore conveyed along the surface of the water; for they were loudest and most distinct at points where the nature of the land, and the intervention of the fort and its buildings, forbade the possibility of this kind of conduction.

Sounds somewhat similar are heard under water at some places on the western coast of India, especially in the harbour of Bombay.[3831] At Caldera, in Chili, musical cadences are stated to issue from the sea near the landing-place; they are described as rising and falling fully four notes, resembling the tones of harp strings, and mingling like those at Batticaloa, till they produce a musical discord of great delicacy and sweetness. The same interesting phenomenon has been observed at the mouth of the Pascagoula, in the State of Mississippi, and of another river called the "Bayou coq del Inde," on the northern shore of the Gulf of Mexico. The animals from which they proceed have not been identified at either of these places, and the mystery remains unsolved, whether the sounds at Batticaloa are given forth by fishes or by molluscs.

Certain fishes are known to utter sounds when removed from the water[3841], and some are capable of making noises when under it[3842]; but all the circumstances connected with the sounds which I heard at Batticaloa are unfavourable to the conjecture that they were produced by either.

Organs of hearing have been clearly ascertained to exist, mot only in fishes[3851], but in mollusca. In the oyster the presence of an acoustic apparatus of the simplest possible construction has been established by the discoveries of Siebold[3852], and from our knowledge of the reciprocal relations existing between the faculties of hearing and of producing sounds, the ascertained existence of the one affords legitimate grounds for inferring the coexistence of the other in animals of the same class.[3853]

Besides, it has been clearly established, that one at least of the gasteropoda is furnished with the power of producing sounds. Dr. Grant, in 1826, communicated to the Edinburgh Philosophical Society the fact, that on placing some specimens of the Tritonia arborescens in a glass vessel filled with sea water, his attention was attracted by a noise which he ascertained to proceed from these mollusca. It resembled the "clink" of a steel wire on the side of the jar, one stroke only being given at a time, and repeated at short intervals.[3854]

The affinity of structure between the Tritonia and the mollusca inhabiting the shells brought to me at Batticaloa, might justify the belief of the natives of Ceylon, that the latter are the authors of the sounds I heard; and the description of those emitted by the former as given by Dr. Grant, so nearly resemble them, that I have always regretted my inability, on the occasion of my visits to Batticaloa, to investigate the subject more narrowly. At subsequent periods I have since renewed my efforts, but without success, to obtain specimens or observations of the habits of the living mollusca.

The only species afterwards sent to me were Cerithia; but no vigilance sufficed to catch the desired sounds, and I still hesitate to accept the dictum of the fishermen, as the same mollusc abounds in all the other brackish estuaries on the coast; and it would be singular, if true, that the phenomenon of its uttering a musical note should be confined to a single spot in the lagoon of Batticaloa.[3861]

Although naturalists have long been familiar with the marine testacea of Ceylon, no successful attempt has yet been made to form a classified catalogue of the species; and I am indebted to the eminent conchologist, Mr. Sylvanus Hanley, for the list which accompanies this notice.

In drawing it up, Mr. Hanley observes that he found it a task of more difficulty than would at first be surmised, owing to the almost total absence of reliable data from which to construct it. Three sources were available: collections formed by resident naturalists, the contents of the well-known satin-wood boxes prepared at Trincomalie, and the laborious elimination of locality from the habitats ascribed to all the known species in the multitude of works on conchology in general.

But, unfortunately, the first resource proved fallacious. There is no large collection in this country composed exclusively of Ceylon shells;—and as the very few cabinets rich in the marine treasures of the island have been filled as much by purchase as by personal exertion, there is an absence of the requisite confidence that all professing to be Singhalese have been actually captured in the island and its waters.

The cabinets arranged by the native dealers, though professing to contain the productions of Ceylon, include shells which have been obtained from other islands in the Indian seas; and the information contained in books, probably from these very circumstances, is either obscure or deceptive. The old writers content themselves with assigning to any particular shell the too-comprehensive habitat of "the Indian Ocean," and seldom discriminate between a specimen from Ceylon and one from the Eastern Archipelago or Hindustan. In a very few instances, Ceylon has been indicated with precision as the habitat of particular shells, but even here the views of specific essentials adopted by modern conchologists, and the subdivisions established in consequence, leave us in doubt for which of the described forms the collective locality should be retained.

Valuable notices of Ceylon shells are to be found in detached papers, in periodicals, and in the scientific surveys of exploring voyages. The authentic facts embodied in the monographs of REEVE, KUSTER, SOWERBY, and KIENER, have greatly enlarged our knowledge of the marine testacea; and the land and fresh-water mollusca have been similarly illustrated by the contributions of BENSON and LAYARD to the Annals of Natural History.

The dredge has been used, but only in a few insulated spots along the coasts of Ceylon; European explorers have been rare; and the natives, anxious only to secure the showy and saleable shells of the sea, have neglected the less attractive ones of the land and the lakes. Hence Mr. Hanley finds it necessary to premise that the list appended, although the result of infinite labour and research, is less satisfactory than could have been wished. "It is offered," he says, "with diffidence, not pretending to the merit of completeness as a shell-fauna of the island, but rather as a form, which the zeal of other collectors may hereafter elaborate and fill up."

Looking at the little that has yet been done, compared with the vast and almost untried field which invites explorers, an assiduous collector may quadruple the species hitherto described. The minute shells especially may be said to be unknown; a vigilant examination of the corals and excrescences upon the spondyli and pearl-oysters would signally increase our knowledge of the Rissoæ, Chemnitziæ, and other perforating testacea, whilst the dredge from the deep water will astonish the amateur by the wholly new forms it can scarcely fail to display.

List of Ceylon Shells.

The arrangement here adopted is a modified Lamarckian one, very similar to that used by Reeve and Sowerby, and by Mr. HANLEY, in his Illustrated Catalogue of Recent Shells.[3881]

A conclusion not unworthy of observation may be deduced from this catalogue; namely, that Ceylon was the unknown, and hence unacknowledged, source of almost every extra-European shell which has been described by Linnæus without a recorded habitat. This fact gives to Ceylon specimens an importance which can only be appreciated by collectors and the students of Mollusca.