Another illustration is that of an accumulation of nacre which has assumed accidental resemblance to a miniature shark. It was found in a gold-lip pearl shell in Torres Straits. The like quantity in globular shape would represent a pearl of great value.
On a calm and luminous day I waded, disrobed, in shallow water as limpid as the fictitious stream which legend says King Solomon improvised at the foot of his throne when the Queen of Sheba attended his court. Lifting her robes--for she imagined the crossing of the water to be a ceremonial device--the gorgeous Queen displayed her shapely calves. The water resting on the verge of the lovely Isle was as delusively clear, but was not deceptive.
It revealed living coral, good to avoid by the barefooted; clams with patterned mantles of various tints--grey, slate-blue, sea-green, brown, and buff; anemones in many shapes, some like spikes of lavender, and irritant and repellent to the touch; some platter-shaped and cobalt-blue; some as living vases with the opalescent tints of Venetian glass, which, abhorring the hand of man, retreat into the sand until only an inconspicuous fringe of neutral tint is visible. Sea-slugs in almost endless form and variety of hue, and many other strange sea things, were among the inhabitants of the reef--a closely packed arena of never-ceasing slaughter.
In the middle of a clump of brown seaweed, which had fallen apart like the neatly dressed hair of a woman, was a black streak, signifying the gape of a wedge-shaped mollusc known as a pinna. The gape was about as long as the parting of a woman's hair and about thrice as wide. As I crouched to note the functions of the animal, my shadow intervened and the caution of the creature was roused, the valves closing so that no sign of the presence of the shell was distinguishable among the slightly wavering, minute particles of alga. Changing my position, so that the pinna might not be deprived of its share of the rays of the sun, the valves soon furtively opened. A slight movement on my part and they closed again, without having revealed any hidden charms.
After a few minutes, a certain confidence being established between us, the pinna emerged from its retirement, in so far as such creatures are permitted by Nature. The mantle of this particular species is shown as a delicate fringe of lace in old gold and black. It ripples along the upper edges of the confining valves, which are intensely black with a pearly lustre. The pretty movements of the mantle--like the swinging of the skirts of a well-apparelled damsel--attracted admiration, and on peering into the shell a glimpse of something precious was obtained.