From the tinted tips of fragile corals to the ooze on the edge of the beach sand there is seething life. Exposed by the ebb tide, the sun-caressed slime glitters and shimmers, so that if the observer is content to stand still for a few moments he shall see myriads of obscure activities, graceful and uncouth, of the existence of which he has not previously dreamt and among which his footsteps make a desolating track. Perhaps in no other earthly scene do the gradations of life blend so obviously in form and appearance. This mud is primal, fertile with primitives, for similitude of environment checks variations.
In such tepid slime primordial life began, and in it even in these latter days the far beginning of superior things may be discovered actively pursuing their craft and purpose in the order of the universe. Worms are abundant, and among them certain genera which might be taken as apt illustrations of the more significant facts of evolution. Studying them, the parting of the ways between two distinct orders, each having a conspicuous feature in common while differing in appearance and habits generally, is made strangely plain, and I propose in my unversed way to demonstrate the line of upward development in a few examples.
Accepting as a primitive form that deplorably thin, phantasmal worm which excavates in the ooze an appropriately narrow shaft indicated by a dimple, or, in some cases, a swelling mound with a well-defined crater and circular pipe, the ascent of the genealogical tree is not beset with any great difficulty. These worms are grey in colour and shoddy in texture, merely a tough description of slime with a crude head and long, simple filaments. The sides of the shafts are smooth, and on the least alarm the nervous inhabitant retracts with surprising alertness. Slightly superior in grade, but in uninterrupted succession, is a similar worm which solidifies its shaft with a kind of mortar and carries it up above the level of the ooze about an inch or so—a crude effort in the direction of the acquirement of some ease of circumstance. These flue-like projections are more frequent on the verge of the sandy beach.
The next in order—still slim, though of a slightly more robust habit of body—has acquired the art of spinning (caterpillar-like) a cocoon, and of causing to adhere to the exterior thereof grains of sand and minute chips of shell. Though this vestlet is very frail and though the sandy outer coat is liable to drop off (when it collapses altogether), it seems to me to indicate distinct progress, a successful accomplishment in the direction of isolation, independence, and security. Does it not signify that the animal has a certain perception of the knowledge of good and evil such as dawned upon Eve as she ate the diverting apple? Eve forthwith took to fig-leaves; the slim worm knitted a shoddy wrapper and reinforced it with grains of sand when it realised that there was something better than slush for a dwelling. The sandy coverlet is evidence of the gift of discrimination.
A still more highly endowed relation spins a similar fabric, upon which are loosely agglutinated numbers of small dead shells, grit, and even opercula a quarter of an inch in diameter. In weight, size, and number of its constituents this exterior armour is altogether disproportionate to the extreme tenuity of its foundation. Too unsubstantial to sustain its own weight, it sprawls, like the track of a tipsy snail, indeterminately, slowly developing its sinuosities over the irregular surface of a rock, and slightly adherent thereto, throughout its whole length. Of this there seem to be several nicely shaded grades, some in the form of galleries laboriously built of a mixture of mud and sand, and each indicating superiority to the naked denizen of the clement mud. They seem to be superior in appearances also, for some of the animals display brightly coloured plume-like tentacles, long and capable of being ostentatiously fluttered.
The individual worm next to be described typifies such a wonderful advance that it might almost be designated a subsequent and intrusive sport, no marked are the distinctions it exhibits. It is one of the shell-binders (PECTINARIA), but its mansion of mosaics is unique and beautiful. In the universal struggle for place, self-preservation, and food, the animal has acquired a higher order of intelligence and keener perceptions of safety and of the niceties of life than its fellows. Living in sand and mud, in obedience to some gracious instinct, it gathers numbers of small shells, grit, and fragments of coral wherewith to construct a tube, somewhat similar in shape to the horn of cornucopia, and from three to six inches long. The materials are cemented together in accordance with a symmetrical design, the interior being lined with a transparent substance, which, when dry, is readily separable from the casing! This creature accomplishes by calculation, choice, and dexterity that which a subtle chemical process does unconsciously for the more advanced mollusc, and that it practised the art of the interlocking of atoms ages before the birth of Macadam can scarcely be doubted.
My imagination loves to dwell on the perceptive faculties possessed by this lowly creature, a creature soft and delicate, merely such and such a length of gelatinous substance, slightly stiffened and toughened and graced with a pair of tentacles glittering like tinsel extended from a marvellously constructed tube.
In certain structural details the animal (which in appearance has greater resemblance to a caterpillar than a worm) is even more remarkable than the ornate dwelling it constructs, for it is an actual though living prototype of the fabled race (catalogued by Othello with the anthropophagi)—
"Whose heads
Do grow beneath their shoulders."
The paradox exists, not as a whim or grimace on the part of Nature but for a definite and vital end. In default the animal would be unable to obey the first law of Nature—self preservation—for it is soft-bodied and its dwelling has the serious defect of being open at both ends. In such plight lacking special organs it would be at cruel advantage in the struggle for existence. The posterior segment of the body is therefore developed into an operculum-like organ, smooth and of horny texture, which closes the narrow end of the tube. The other extremity is more elaborately guarded, the anterior segment being fringed with a frontal membrane, while the second segment forms a disc, the minute mouth orifice with the true tentacles and gills being debased to the third segment.