. The animans and man; an elementary textbook of zoology and human physiology. ly in theshape of delicate freely projecting tufts arranged in rowsalong the back. The body is often strikingly and variedlycolored. These soft, naked sea-slugs live near the shore,creeping about among the rocks and seaweeds. About athousand species of nudibranchs are known. Among the shell-forming marine Gastropods there isgreat variety in the size and shape and coloring of the are beautifully colored and patterned; others areoddly and fantastically shaped. The cowries, or porcelainshells, familiar in c
. The animans and man; an elementary textbook of zoology and human physiology. ly in theshape of delicate freely projecting tufts arranged in rowsalong the back. The body is often strikingly and variedlycolored. These soft, naked sea-slugs live near the shore,creeping about among the rocks and seaweeds. About athousand species of nudibranchs are known. Among the shell-forming marine Gastropods there isgreat variety in the size and shape and coloring of the are beautifully colored and patterned; others areoddly and fantastically shaped. The cowries, or porcelainshells, familiar in collections of ocean curiosities, have alarge body whorl and a very short flat spire, and the brightly 78 THE ANIMALS AND MAN colored shell looks as if enamelled. Some of the coast tribesof Africa once used, and perhaps still use to some extent,cowries as money. The limpets are among the most abun-dant of the seashore molluscs, their low, broadly conical shellsbeing plentifully scattered over the rocks between oyster-drills are Gastropods with odd spiny shells. FIG. 88. The giant squid, Ommatostrephes calif arnica. (From speci-men with body, exclusive of tentacles, four feet long, thrown by waveson the shore of the Bay of Monterey, Calif.) which do much harm in oyster-beds by settling down on theoysters, boring holes through the shells and eating the softparts within. The helmet-shells, from which shell cameosare cut, are composed of layers of shell material of differentcolors. Among the specially beautiful shells are the cone-shells, the olive-shells, the ivory-shells, etc. There are two principle groups of Cephalopods, namelythe Decapods and the Octopods. The decapods, as theirname indicates, have ten feet or arms surrounding themouth, and the body is usually elongate and containing ahorny pen or calcareous bone. This group includesthe cuttle-fishes or sepias, from which is obtained sepia inkand the cuttle-fish bone used to feed canary birds. The inkis a secreti
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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology
