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some molluscs are seasonal in their appearances and disappearances, the majority are always with us, though subject to many casualties. A few months since an epidemic broke out among a certain species of sea urchins (Echinus), spherical animals with shells thickly set with spines, keen and exceedingly brittle. The beaches were strewn with thousands of the dead, no apparent exterior injury having been suffered. The particular species afflicted gathers to itself, seemingly as a disguise, but perhaps as ballast, the dead shells of cockles, which are retained by the spines. It was noticed that the dead were not encumbered.

A curious and one of the rarest of local shells is that known as the elephant's tusk (DENTALIUM APTINUM). Pure white and slightly fluted longitudinally, it typifies the marvellous extent of Nature's requirements and her fertility in design. It is especially interesting to note that the existence of the species in Australian waters has not hitherto been recorded, the nearest known locality being the Moluccas.

The DRUPA RICINUS (so specifically called because of resemblance to the prickly seeds of the castor-oil plant) has another feature almost unique--two ivory-white projections in the mouth, singularly like a baby's teeth. In the waters of Florida is a distinct curiosity in the form of an altogether different mollusc which is commonly known as the "bleeding-tooth shell," the gory stains about the base of the tooth being highly significant. The local example of the whimsicality of Nature owes its excellence to absolute purity. No fond mother crooning to her first-born ever looked on budding teeth more delightful in modelling and pearliness.

CHAMA LAXARUS belongs to the same family as the clams, the largest of living molluscs, its specific title being an allusion to the tattered raiment of the beggar of the most edifying of parables. Occasionally the china-white upper valve is decorated with a broad streak of buff. Some of the genera are attached to coral or rock indifferently by either valve, and it is exceptional to find on the beach a perfect specimen--that is, the valves united. Since on the reef the shells are frequently protectively disguised with seaweed and other growth, it is only after the violence of a cyclone that the amateur collector expects to be rewarded.

Unlike some others of the family, the cockscomb oyster, though not objecting to the near-by presence of its kind, seems to hate a crowd. Half a dozen may occupy separate areas on a rock, and solitary specimens lie embedded and strongly anchored in the sand. A typical example may weigh over seven pounds. So big and weighty a shell can scarcely be sensible of its invariable burden of parasites and other encumbrances--but the variety of such tenants never fails to excite curiosity. That which is illustrated accommodated another oyster of delicate texture, a thorny clam (which has the reputation of being poisonous), a mass of seaweed, a serpentine mollusc, two species of coral--the red organ-pipe and a mushroom--three burrowing crabs, besides a number of smaller animals, fixed and mobile, in addition to the congregation of less obvious life critical examination would undoubtedly have revealed.

Most species of univalves are wanderers, many bivalves are free, and multivalves become fixed at an early stage of existence. The goose-necked barnacle, with its five valves, comes in its myriads attached to derelict coco-nuts, floating logs, and pumice-stone. The species owes its name to the fabulous belief that it was the preliminary state of the barnacle goose of the Arctic regions, the filaments representing the plumage and the valves the wings. It has been found on shells, whales, turtles, and marine snakes.

In the mud close to the edge of the beach sand one of the most singular of marine animals exists, and often its empty, horny, flexible, semi-transparent shell, always tinted green, may be found. It is known in some works as LINGULA ANATINA, and by the natives of this Isle, by whom a certain part of it is eaten, as "Mill-ar-ing." A pinhole in the mud indicates the presence of the animal, and the hungry black boy, thrusting his hand with outspread fingers below it, closes the fingers and withdraws anything but an inviting morsel. To the tongue-shaped shell is attached a pedicle or stalk, attaining a length of ten inches, opaque and tough, which is broken off, seared over the fire, and eaten with apparent relish. It is remarkable that in localities in which this mollusc is found a seaweed occurs similar in shape and size, the chief difference in appearance being in the length of the stalk, which in the plant is thin and membranous.

The Phorous, or carrier, otherwise the mineralogist, is remarkable for its extraordinary habit of cementing to its exterior stones of irregular size, and in some cases dead shells of other species, an office performed by the use of an exceptionally long tongue. Its movements are said to be very clumsy and erratic, as if its self-imposed burden was too cumbersome for its strength. Personal observation fails to verify its staggering gait, for dead specimens only have been found. The stones are, no doubt, designedly acquired as a disguise and so represent another form of life insurance. When stationary the mineralogist successfully baffles observation; but some day, peradventure, in a moment of preoccupation, it will reveal itself lurching along over the rough country it favours. How few living things escape the "penalties of Adam." Some bear sorrows, some stones.

Among the fixed molluscs are what is known as the winged shells, to which the "pearl oysters" belong. The name is apt, for the expanded valves are not unlike the form of a bird in flight. The illustration shows a rare species, several specimens of which were found attached to the mooring-chain of a buoy by what is known as the "byssus," a bunch of tough fibres which passes through an hiatus in the margins of the valves. Like the king's daughter of the Psalmist, PTERIA PEASEI is "all glorious within," the nacreous surface, margined with lustrous black, shining like silver with a tinge of blue.

Only a very small proportion of the species of shells to be found on the shore of this bay have been enumerated. In a work of general character a complete commentary on any particular branch of natural science would be out of place, nor is it competent for one who has but a trifling knowledge of a special subject to deal with it in an enlightening manner. It would be highly interesting to ascertain by study and observation why the denizens of so many parts of the ocean meet in community in such a narrow space, though it may not be very difficult to present a fairly satisfactory theory for the continuous presence of many species by reference to existing features and prevalent conditions. Within the area of the bay the water varies in depth from a few feet to four fathoms, the rise and fall of the tide being about two fathoms. The fringing coral reef represents all stages of development and decay--live growth on the outer edge, ever encroaching on the deeper water, and comprising many varieties; dying masses on the shore-side, and a considerable extent of dead and denuded relics lying in mud. There are also weedy patches, bare sand-banks of limited extent, uncovered at low water, and muddy depressions both in the deep and shallow portions and clean sand. Strong currents race past the sand-spit and across the bay, carrying, no doubt, continual supplies of spat from elsewhere to settle in quiet places. No one who has lived on the margin of the tropic sea can be astounded at its prolific life, though it may be a matter of unceasing wonder that along a beach not more than four hundred yards in extent should be found shells representative of species existing in nearly all the warm waters of the world.

And there are other isles with other beaches. One may present a narrow strip of soft sand, cringing and squeaking under foot, almost entirely composed of finely ground coral and shells, among which polished fragments of red coral are to the beach-comber as the "colours" the gold fossicker may find in his dish--prospective of reward. They reinspire the like fervour which leads to the discovery of mountains as well as microbes, for may they not signify the existence within the bounds of the Great Barrier Reef of the precious coral of the Mediterranean and the Red Sea? Above such hopeful sands lies a band formed of stag's-horn coral, bleached snow-white, each time lying at right angles to the sea, and higher up on the strand are blocks and lumps of weather-stained coral among which vegetation is springing. A few yards further back stands a group of Pandanus palms, the van of the dense and intricate jungle covering rock and ridge.

The shore of the sister islet may at the moment be but series of steeply shelving banks of coral debris, to the base of the granite ramparts over which the luxuriant foliage falls.

Each islet has its distinguishing features, each beach its budget of news for ears attuned to "small measures," each its display of seemly things--the sweepings of the floor of the sea.


THE LOST ISLE



"Some unsuspected Isle in far-off seas."

BROWNING.


In a region of rare serenity it lay--a blue stud on a silver shield--aloof from other lands--unmapped, untarnished, pure, gleaming in the dawn of exultant day.

Emblem of perfection, its charms were imperative, partly because of remoteness from the taint of man-trodden land, mainly because, by right of discovery, it was joyfully mine. Could anything be more desirable than such a blending of jungle-clad mountains, verdurous hills, sheltered valleys, orange-tinted beaches, with the shadows of white headlands staining the sea purple?

An all-comprehending glance revealed the Isle in the shape of a five-rayed star, each ray irregularly serrated. Here was promise of many a landlocked cove to which the breathings of the sea would be foreign. Unsalted streams wound among the foothills of the central mountain, whence a spire of rose-red porphyry shot into the luminous sky from unbroken jungle, the superficies of which were soft and brilliant as sodden moss.

Some of the valleys showed in succession ever-green, flower-bedecked glades, with great trees and blossoming shrubs in scattered clumps and patches, among which sinuous ribbons of jungle denoted the courses of deep hidden streams. Others were merely precipitous depressions in the unbroken mass of foliage, variegated with aspiring palms so slender of shaft that their unceasing swaying in the still air seemed an act of unconscious affectation for the display of huge bunches of gaudy fruit, seductive and dulcet to the taste. Spider-webbed tree-ferns with furry, water-bespangled trunks stood in crowded groves on the brink of spray-creating cascades and along the margins of cool rivulets which murmured as they hurried to the sea.

Water-dripping moss padded the lintels of grottos, before which dangled translucent ferns of delicate form, yet so rich and intense with life that crozier-tipped fronds took the hue of flowers--coral-red, golden-bronze, and yellow; while golden dust clung to hairy undersides like pollen to the thighs of hive-returning bees. Deep in perpetual shadow lived a shy plant with heart-shaped leaves, so succulent and distended as to resemble green capsules, and in association with each leaf was a single semi-transparent fruit, pink with a central glow like the fire of opal, but so frail that upon touch it resolved into a dewdrop which glistened, trembled, and was gone in a moment.

In the full blaze, feather-foliaged trees crowned with gigantic red blossoms offered as a sacrifice fruit which blushed before the insistent gaze of the sun; while beneath this gay canopy vine and creeper and pliant shrub wove an undergarment which screened the moist earth and created a realm of subdued light in
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