Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote . elementarytextbo01clau Year: 1892-1893 fh FIG. 115.—Developmental history of Distomum (in part after R. Leuckart). a, Free- swimming ciliated embryo of the liver fluke.—6, the same contracted, with rudiment of alimentary canal D; and aggregations of cells ; On, rudiment of genital gland; Ex, ciliated apparatus of the excretory system.—c, Sporocyst, which has proceeded from Distomum embryo, filled with Cercarife C; B, spine of a Cercaria.— d, Redia with
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote . elementarytextbo01clau Year: 1892-1893 fh FIG. 115.—Developmental history of Distomum (in part after R. Leuckart). a, Free- swimming ciliated embryo of the liver fluke.—6, the same contracted, with rudiment of alimentary canal D; and aggregations of cells ; On, rudiment of genital gland; Ex, ciliated apparatus of the excretory system.—c, Sporocyst, which has proceeded from Distomum embryo, filled with Cercarife C; B, spine of a Cercaria.— d, Redia with pharynx PA ; alimentary canal, D ; Ex, excretory organs; C, contained Cercariae.—e, free Cercaria; S, sucker ; D, gut. comparable to larvae, produce by means of the so-called germ granules or spores a generation of offspring known as Cercarise (fig. 115, e), which become free, and then make their way into the body of a new host, and, after the bss of the oral spine and caudal appendage, encyst (fig 115/}. Hence they are carried into the body of the permanent host to develop into the sexual adult form.
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