. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. produces Theyoung liver-flukes wriggle out of the snail, attach them-selves to damp grass, lose their tails, and encyst them-selves. If these cysts be eaten by asheep, they develop in the sheepsbody into an adult liver-fluke (). Thus the stages which we canrecognize in the liver-fluke are : - First generation : egg from liver-fluke, larva, and adult generation : redia (this may be several times repeated).Third generation : cercaria larva, encysted larva, and adu
. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. produces Theyoung liver-flukes wriggle out of the snail, attach them-selves to damp grass, lose their tails, and encyst them-selves. If these cysts be eaten by asheep, they develop in the sheepsbody into an adult liver-fluke (). Thus the stages which we canrecognize in the liver-fluke are : - First generation : egg from liver-fluke, larva, and adult generation : redia (this may be several times repeated).Third generation : cercaria larva, encysted larva, and adult liver-fluke. 1 Fig. 140, B. 2 Fig. 140, C. 3 These, while young, have tails, and are called ever FIG. 145. - Distomum,the liver-fluke. Excr., excretorypore; mo., mouth; rep?.,reproductive aperture ;-srA1/*., posterior Parker and Has-well. 156 ZOOLOGY Another flat worm is such an abject parasite that it haslost most of the organs usually possessed by worms. This isthe tapeworm (Fig. 147). When the eggs of the tape-worm are taken into the body of an herbivorous animal, theembryos develop there for a way and then stop. Whenflesh containing these embryos is eaten by a carnivorous eye.
Size: 1184px × 2111px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
