In the absence of your authentication, and of all geological explanation of the continuous sounds, and of all source of fallacy from the hum and buzz of living creatures in the air or on the land, or swimming on the waters, I must say that I should be inclined to seek for the source of sounds so audible as those you describe rather among the pulmonated vertebrata, which swarm in the depths of these seas—as fishes, serpents (of which my friend Dr. Cantor has described about twelve species he found in the Bay of Bengal), turtles, palmated birds, pinnipedous and cetaceous mammalia, &c.
The publication of your memorandum in its present form, though not quite satisfactory, will, I think, be eminently calculated to excite useful inquiry into a neglected and curious part of the economy of nature.
I remain, Sir,
Yours most respectfully,
ROBERT E. GRANT.
Sir J. Emerson Tennent, &c. &c.
Footnote 3691: [(return)]
Cypræa Argus.
Footnote 3701: [(return)]
In one of these beautiful little bays near Catchavelly, between Trincomalie and Batticaloa, I found the sand within the wash of the sea literally covered with mollusca and shells, and amongst others a species of Bullia (B. vittata, I think), the inhabitant of which, has the faculty of mooring itself firmly by sending down its membranous foot into the wet sand, where, imbibing the water, this organ expands horizontally into a broad, fleshy disc, by which the animal anchors itself, and thus secured, collects its food in the ripple of the waves. On the slightest alarm, the water is discharged, the disc collapses into its original dimensions, and the shell and its inhabitant disappear together beneath the sand.
Footnote 3702: [(return)]
Ianthina communis, Krause and I. prolongata, Blainv.
Footnote 3711: [(return)]
COSMAS INDICO-PLEUSTES, in Thevenot's ed. t i. p. 21.
Footnote 3712: [(return)]
At Kottiar, near Trincomalie, I was struck with the prodigious size of the edible oysters, which were brought to us at the rest-house. The shell of one of these measured a little more than eleven inches in length, by half as many broad: thus unexpectedly attesting the correctness of one of the stories related by the historians of Alexander's expedition, that in India they had found oysters a foot long. PLINY says: "In Indico mari Alexandri rerum auctores pedalia inveniri prodidere."—Nat. Hist. lib. xxxii. ch. 31. DARWIN says, that amongst the fossils of Patagonia, he found "a massive gigantic oyster, sometimes even a foot in diameter."—Nat. Voy., ch. viii.