Elementary text-book of zoology (1884) Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 fh FIG. 115.—Developmental history of Distomum (in part after B. Leuckart). a, Free- swimming ciliated embryo of the liver fluke.—b, the same contracted, with rudiment of alimentary canal D; and aggregations of cells ; OP, rudiment of genital gland; Ex, ciliated apparatus of the excretory system.—c, Sporocyst, which has proceeded from a Distomum embryo, filled with Cercariae C; S, spine of a Cercaria.— f, Redia with pharynx Ph ; alimentary canal, D ; Ex, excretory organs; C, contain
Elementary text-book of zoology (1884) Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 fh FIG. 115.—Developmental history of Distomum (in part after B. Leuckart). a, Free- swimming ciliated embryo of the liver fluke.—b, the same contracted, with rudiment of alimentary canal D; and aggregations of cells ; OP, rudiment of genital gland; Ex, ciliated apparatus of the excretory system.—c, Sporocyst, which has proceeded from a Distomum embryo, filled with Cercariae C; S, spine of a Cercaria.— f, Redia with pharynx Ph ; alimentary canal, D ; Ex, excretory organs; C, contained Cercarise.— e, free Oercaria; S, sucker ; D, gut. comparable to larvae, produce by means of the so-called germ granules or spores a generation of offspring known as Cercarife (fig. 115, e), which become free, and then make their way into the body of a new host, and, after the loss of the oral spine and caudal appendage, encyst (fig 115 f). Hence they are carried into the body of the permanent host to develop into the sexual adult form. 9
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