Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] CRAYFISH, LOBSTERS, CRABS, SHRIMPS, ETC. 119 periwinkle shell, in which they may hide. The body is thrust well into the shell and the opening guarded by the feet and claws. As the crab develops it becomes more and more adapted to the shell in which it is living. The abdomen remains soft and follows the convolutions of the shell. Only the last two abdominal appendages remain, and these are modified into hook-like organs. The first two or three pairs of thoracic
Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] CRAYFISH, LOBSTERS, CRABS, SHRIMPS, ETC. 119 periwinkle shell, in which they may hide. The body is thrust well into the shell and the opening guarded by the feet and claws. As the crab develops it becomes more and more adapted to the shell in which it is living. The abdomen remains soft and follows the convolutions of the shell. Only the last two abdominal appendages remain, and these are modified into hook-like organs. The first two or three pairs of thoracic legs FIG. 45.—A hermit crab, Pagarus sp. in a sea-snail shell. Upper figure shows another crab removed from its shell. (Reduced.) become curiously modified and help close the opening of the shell. The right claw is often very much larger than the left and well fitted for the dual purpose of capturing prey and acting as a door. As the crab grows, its adopted home be- comes too small for it, and from time to time it must seek larger shells. Some of the hermit crabs always have certain stinging
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