Beginners' zoology . ngs ? Place a few drops of ink near the base of the hindlegs of a crayfish resting quietly in shallow water. Whereis the ink drawn in ? Where does it come out ? To ex-plain the cause and the purpose of this motion, place a cray-fish in a large glass jar containing water, and see thevibratory motion of the parts under the front portion ofthe body. There is under the shell on each side of the bodya gill paddle, or gill bailer, that moves at the same rate. Senses.—Crayfish are best caught with a piece of meator beefs liver tied to a string. Do they always lose holdas soon as
Beginners' zoology . ngs ? Place a few drops of ink near the base of the hindlegs of a crayfish resting quietly in shallow water. Whereis the ink drawn in ? Where does it come out ? To ex-plain the cause and the purpose of this motion, place a cray-fish in a large glass jar containing water, and see thevibratory motion of the parts under the front portion ofthe body. There is under the shell on each side of the bodya gill paddle, or gill bailer, that moves at the same rate. Senses.—Crayfish are best caught with a piece of meator beefs liver tied to a string. Do they always lose holdas soon as they are lifted above the water? What do you CRUSTACEANS 53 conclude as to the alertness of their senses ? Does the cov-ering of their bodies suggest the possession of a delicate dull sense of touch? Of what motions are the eyes capable? Touch one ofthe eyes. The result? Can a crayfish see in all direc-tions? To test this, place a crayfish on a table and trywhether you can move to a place where you can see the. Fig. 8i. — Crawfish(dorsal surface).
Size: 1330px × 1879px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
