Beginners' zoology . Fig. 93. — Crab from Fig. 94.— Hermit Crab,using shell of sea snailfor a house. Decapods. — All Crustacea which have ten feet belong in the order called decapoda (ten-footed). This order includes the crabs, lobsters, shrimp,etc. The crabs and the lobsters are ofconsiderable importance because ofuse as food. Small boys sometimescatch crayfish, and in some instancesare known to cook and eat them foramusement, the only part cooked being the muscular tail. The crabs tail is small and flat and held under the body (Fig. 93). Since the limy covering to serve the purpose o
Beginners' zoology . Fig. 93. — Crab from Fig. 94.— Hermit Crab,using shell of sea snailfor a house. Decapods. — All Crustacea which have ten feet belong in the order called decapoda (ten-footed). This order includes the crabs, lobsters, shrimp,etc. The crabs and the lobsters are ofconsiderable importance because ofuse as food. Small boys sometimescatch crayfish, and in some instancesare known to cook and eat them foramusement, the only part cooked being the muscular tail. The crabs tail is small and flat and held under the body (Fig. 93). Since the limy covering to serve the purpose of protection is not soft enough to be alive and growing, it is evident that the Crustacea are hampered in their growth by their crusty covering. Dur- -^^^^^fe ing the firstyear the cray-fish sheds itscovering, ormoults threetimes, and once each yearthereafter. It-grows very fastfor a few days just after moul-ting, while theFig. 95. —Development of a Crab. covering is soft a, nauplitis just after hatching; b,c,d, zcyia; ?, mcgalops; _/, adu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
