Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 353 C Sc. tt'fntnixthiim. Mehlis. also in the intestine of the horse. The embryos, after migrating into the intestine, become encysted in the walls of the rectum and caicum, assume within the cyst their definite form, break out from the cyst, and escape again into the intestine, {.'ui-iillinnix rli-yiuix Zed., in the Perch. Fam. Trichotrachelidae. with long neck-like thin anterior portion of the body. Mouth small, without papilhe. (Esophagus very long, traversing a peculiar co
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 353 C Sc. tt'fntnixthiim. Mehlis. also in the intestine of the horse. The embryos, after migrating into the intestine, become encysted in the walls of the rectum and caicum, assume within the cyst their definite form, break out from the cyst, and escape again into the intestine, {.'ui-iillinnix rli-yiuix Zed., in the Perch. Fam. Trichotrachelidae. with long neck-like thin anterior portion of the body. Mouth small, without papilhe. (Esophagus very long, traversing a peculiar cord of cells. Tri<-hort'2)haliix Goeze. Anterior part (fig. 285) of the body elongated and whip-shaped: posterior part cylindrical and sharply distinct, enclosing the generative organs, in the male it is coiled up. Lateral lines absent. Main median lines present. The penis is slender and furnished with a sheath, which is turned inside out when the former is protruded. The hard-shelled, citron-shaped eggs undergo the first part of their development in water. Tr. Rud. In the human colon : these worms do not live free in the intestine, but bury their filiform anterior extremity in the mucous membrane (fig. 285). The eggs pass out of the host with the fasces, as yet without a sign of beginning development, which only takes place after a prolonged sojourn in the water or in a damp place. According to the ex- periments of Leuckart per- formed with Tr. qfKnis of the ^lieep and Tr. crcnatus of the pig, embryos with the egg membranes, if introduced into the intestine, develop into the adult Trieoceplialus; and we may therefore conclude that the human Tr. d'ixpar is intro- duced directly, and without an intermediate host either in the drinking water or in uncleaned food. The young Tr. rfisjwr is fit first hair-like, and re- sembles a Trichina, and only a FIG. 2S5.—Ti-ichocefikaliu: disjjar (after R. Leuckart). 11, Egg ; I, female ; c, male with the anterior part ut' the b
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