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My Tropic Isle

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emerging sound and whole as a bee from its cell, all its organs equipped to ply their respective offices. With pardonable affectation of vanity it has finally fitted itself for appearance in public by the assumption of three or four buff and brown decorations upon its milk-white shell, which quickly blend into a pattern varying in individuals, of blotches and clouds in brown, yellow, and white. In maturity the mollusc weighs several pounds, its shell has a capacity for as much as two gallons of water, and is coloured uniformly buff, while in old age infantile milk-white reasserts itself. It is not for such as I am in respect of the teachings of science to say whether the development of the perfect animal from a few drops of translucent jelly--as free from earthly leaven as a dewdrop--is to be more distinctly traced, in the case of this huge mollusc than in other elementary forms. All that it becomes an unversed student of life's mysteries to suggest is that this example gives bold advertisement to the marvellous process. Many of the secrets of life are written in script so cryptic and obscure that none but the wise and greatly skilled may decipher it, and they only, when aided by the special equipment which science supplies. In this case the firm but facile miracle is recorded in words that he that runs may read. Independent of microscope the unskilled observer may trace continuity in the transformation of jelly to life. The sea-drop, lovely in its purity, knowing neither blemish nor flaw, becomes an animal with form and features distinctive from all others, with all essential organs, means of locomotion, its appetite, its dislikes, its care of itself, its love for its kind, its inherent malice towards its enemies--all evolved in a brief period from the concentrated essence of life. "If, as is believed, the development of the perfect animal from protoplasm epitomises the series of changes which represent the successive forms through which its ancestors passed in the process of evolution" (these are the words of Professor Francis Darwin) what a graphic, what a luminous demonstration of evolution is here presented! In a brief previous reference to this mollusc it was stated that the infants in their separate capsules were in a state of progressive development from the base to the apex of the cluster, those in the base being the farther advanced. Investigations lead to a revision of such statement. No favour seems to be enjoyed by first-born capsules. Development is equable and orderly, but as in other forms of life the contents of certain capsules seem to start into being with a more vigorous initial impulse than others, and these mature the more speedily. A sturdy infant may be screwing its way out of its cradle, while in a weakly and degenerate brother alongside the thrills of life may be far less imperative. The pictures illustrate isolated scenes in the life-history of the mollusc, which in a certain sense offers a solution to, the conundrum stated by job "Who, hath begotten the drops of dew?" PROTECTIVE COLORATION July 17, 1909. Found a small cowry shell of remarkable beauty on dead coral in the Bay. At first sight it appeared as a brilliant scarlet boss on the brown coral, and upon touching it the mantle slowly parted and was withdrawn, revealing a shell of lavender in two shades in irregular bands and irregularly dotted with reddish brown spots; the apertures were richly stained with orange, and the whole enamel exceedingly lustrous. Most of the molluscs of the species conceal themselves under mantles so closely resembling their environments as to often render them invisible. In this case the disguise assumed similitude to a most conspicuous but common object of anomalous growth, seeming to be a combination of slime and sponge. CHAPTER XIV SOME CURIOUS BIVALVES Though certain species of molluscs have their respective habitats, and that which is considered rare in one part may be common in another, there are few which have not a general interest for the scientific conchologist. Collectors prize shells on account of their rarity and beauty; the man of science because of the assistance they afford in the working out of the universal problems of nature. Neither a collector nor a scientific student, my attitude towards marine objects is that of a mere observer--an interested and often wonder-struck observer--so that when I classify one species of mollusc as common and another as rare I am judging them in accordance with my own environment and information, not from a general knowledge of one of the most entertaining branches of natural history. From this standpoint I may refer to four or five species which stand out from the rest in interest and comparative rarity. An oyster (OSTREA DENDOSTREA FOLIUM), too mean of proportions, too dull and commonplace of colour to be termed pretty, worth nothing, and justifying, in appearances its worthlessness, is remarkable for the exercise of a certain sort of deliberate wit in accordance with special conditions. Nature provides various species of the great oyster family with respective methods of holding their own in the sea, and in the case under review she permits the individual to exercise a choice of two different methods of fixture as chance and the drift of circumstances decide its location. From the bases of the valves spring three or more pairs of hook-like processes which, if Fate decides upon a certain coral host, encircle a slim "twig," creating for the mollusc a curious resemblance to a short-limbed sloth hugging tightly the branch of a tree. When the spat happens to settle in places where coral is not available the hooks or arms are but crudely developed. It becomes a club-footed cripple, its feet adherent by agglutination or fusion to a rock or other and larger mollusc, dead or alive. In fact, the shrewd little oyster responds to its environment, clasping a twig with claws or cementing itself to an unembraceable host in accordance as contingencies insist. Another mollusc (AVICULA LATA), sometimes found in company with the clinging oyster, resembles, when the fragile valves are expanded, a decapitated butterfly, brick-red in colour, with an overshirt of fine and elaborate network, orange tinted. The interior is scarcely less

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