. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 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 Cercar
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 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 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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