. Beginners zoology. Zoology. Fig. 94.â Hermit Crab, using shell of sea snail for a house. Decapods. â All Crustacea which have ten feet belong in the order called decap'oda (ten-footed). This order includes the crabs, lobsters, shrimp, etc. The crabs and the lobsters are of considerable importance because of use as food. Small boys sometimes catch crayfish, and in some instances are known to cook and eat them for amusement, the only part cooked being the muscular tail. The crab's tail is small and flat and held under the body (Fig. 93). Since the limy covering to serve the purpose of protecti
. Beginners zoology. Zoology. Fig. 94.â Hermit Crab, using shell of sea snail for a house. Decapods. â All Crustacea which have ten feet belong in the order called decap'oda (ten-footed). This order includes the crabs, lobsters, shrimp, etc. The crabs and the lobsters are of considerable importance because of use as food. Small boys sometimes catch crayfish, and in some instances are known to cook and eat them for amusement, the only part cooked being the muscular tail. The crab's 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- >^^^C "^^^ ins: the first year the cray- fish sheds its covering, or moults three times, and once each year thereafter. It grows very fast for a few days just after moul- ting, while the Fig. 95.â Development ok a Crab. covering is soft a, naiipliusjust after hatching; 6,c,d, zoea; f, megalops; _/, adult. Jind CXtensiblC. Question: Which stage is most like a crayfish? Compare '*â '*â with metamorphoses of insects. bmCC It IS 3X. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coleman, Walter M. Toronto : Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
