. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. CESTODA. 835 The proglottides have a marginal sexual opening. The vagina is usually long, separated from the uterus, and enlarged at the end to form a receptaculum seminis (fig. 265). The young stages are Cysticerci or Cysticercoids, rarely quite •without caudal vesicle ; parasitic in warm and cold-blooded animals. Tan la L. ( Cystoteenia R. Lkt). Development takes place with large vesicles. The heads arise from the embryonic vesicle itself. T. solitim. L. 2 — 3 metres long. The double circ
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. CESTODA. 835 The proglottides have a marginal sexual opening. The vagina is usually long, separated from the uterus, and enlarged at the end to form a receptaculum seminis (fig. 265). The young stages are Cysticerci or Cysticercoids, rarely quite •without caudal vesicle ; parasitic in warm and cold-blooded animals. Tan la L. ( Cystoteenia R. Lkt). Development takes place with large vesicles. The heads arise from the embryonic vesicle itself. T. solitim. L. 2 — 3 metres long. The double circle of hooks is composed of 26 hooks. The ripe proglottides are 8 — 10 mm. long and 6 — 7 mm. broad ; the uterus has 7 — 10 dendritic branches. It lives in the human intestine. The Bladder-worms belonging to it (Ciistirernis celluloses) live principally in the dermal cellular tissue and in the muscles of pigs, but also in the human body (muscles, eyes, brain), in which self-infection with them is possible if a Tania is present in the digestive canal ; more rarely in the muscles of the Eoe-deer, the Dog, and the Cat. In the human brain the Cystlccrcvs acquires an elongated form, and sometimes does not produce a head. T. saglnata Goeze=mediocaneHata Kiichcnm., in the intestine of Man, distin- guished by the older helminthologists as a variety of T. soliitiu. Head without circle of hooks or rostellum, but with four more powerful suckers. The Tape- worm reaches a length of four metres, and becomes much stronger and thicker. The mature proglottides are about 18 mm. long and 7 — 9 mm. broad. The uterus forms 20 — 35 dichotomous side branches. The Cysticercus lives in the muscles of the ox (fig. 273). It appears to be principally distributed in the warmer parts of the Old World, but is often found in great numbers in many places in the north. T. scrrata Goeze, in the intestinal canal of the dog. The Cysticercus is known as Cystieei'cvs pisciformis in the liver of the Hare
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