. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. THE C'llAYFlSH. 85 the gullet trace nerves to the eyes, anteniue, and iintennuliu. 1». Cut open the stomach, wash it out with water, and look on its inner walls for teeth. 10. Study the joint in one of the big pinchers. Pick out the muscle from the end of the segment, and find the tMn, tough, white tendons. Seize these with the forceps and pull alternately, to see how the claw is sliut and opened. 11. In what characters is tiie crayfisli like the grass- h(.i)per? In w^hat do these animals differ? 1± Why should the n
. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. THE C'llAYFlSH. 85 the gullet trace nerves to the eyes, anteniue, and iintennuliu. 1». Cut open the stomach, wash it out with water, and look on its inner walls for teeth. 10. Study the joint in one of the big pinchers. Pick out the muscle from the end of the segment, and find the tMn, tough, white tendons. Seize these with the forceps and pull alternately, to see how the claw is sliut and opened. 11. In what characters is tiie crayfisli like the grass- h(.i)per? In w^hat do these animals differ? 1± Why should the name Crustacea be applied to such animals as the crayfish? THE DEVELOPMENT OF THE CRAYFISH. The eggs are glued in masses to the swimmerets, under tlie abdomen of-the female, and thus carried till they are liatched, and for some time afterward the young cling to the swinnnerets. In its growth the crayfish 'sheds its crust, or moults, several times. In this process the carapace separates from the abdomen above, and cracks along the l)aek. By a series of severe efforts the crayfish extricates Itself, at first soft, defenceless, and correspondingly 'iiiiid. Great difficulty is experienced in withdrawing the l⢠,: â ' 0: .. 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 Colton, Buel P. (Buel Preston), 1852-1906. Halifax, N. S. : T. C. Allen; Boston : D. C. Heath
Size: 904px × 2765px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
