. Beginners' Zoology . Fig. 8i. —Crayfish (dorsal surface).. Fig. 82. crayfish without seeing its eyes. What are the advantagesand disadvantages of having the eyes on stalks ? Touch the body and the several appendages of thecrayfish. Where does it seem most sensitive to touch ?Which can reach farther, the antennae or the big claws?Why are short feelers needed as well as long ones ? Make a loud and sudden noise without jarring the cray-fish. Is it affected by sound? External Anatomy (Figs. 81, 82, 83, 84). — Is the body ofthe crayfish rounded out (convex) everywhere, or is anypart of its surfac
. Beginners' Zoology . Fig. 8i. —Crayfish (dorsal surface).. Fig. 82. crayfish without seeing its eyes. What are the advantagesand disadvantages of having the eyes on stalks ? Touch the body and the several appendages of thecrayfish. Where does it seem most sensitive to touch ?Which can reach farther, the antennae or the big claws?Why are short feelers needed as well as long ones ? Make a loud and sudden noise without jarring the cray-fish. Is it affected by sound? External Anatomy (Figs. 81, 82, 83, 84). — Is the body ofthe crayfish rounded out (convex) everywhere, or is anypart of its surface either flat or rounded in (concave) ? 54 BEGINNERS ZOOLOGY What colour has the crayfish? Is this colour of any use tothe crayfish? Make out the two distinct regions or divisions of the body(Fig, 8i). The anterior (front) region is called the head-chest or cephalothorax, and the posterior (rear) region is called the region islarger ? Why ?Which is flex-ible ? Why ? Is the covering of the body hard or soft ? What What are its dis-
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