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 200 tho parasitic animals from various wood-lice and Crustacea, which were assigned by Cienkowski to the fungi, under the name of Ai/m t>i<Iiitin })arasiticum, remind us by their reproduction no less of the Gregarince and tt ft C <t their cysts. The Coccidia which we meet with in. the cells of the epithelium of the intes- tine as well as in the bile- ducts of Mammalia should also be regarded as Grcya- rince (f
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 200 tho parasitic animals from various wood-lice and Crustacea, which were assigned by Cienkowski to the fungi, under the name of Ai/m t>i<Iiitin })arasiticum, remind us by their reproduction no less of the Gregarince and tt ft C <t their cysts. The Coccidia which we meet with in. the cells of the epithelium of the intes- tine as well as in the bile- ducts of Mammalia should also be regarded as Grcya- rince (fig. 151). They trans- form themselves into egg- shaped zoosperms by the formation of a capsule and the production of several spores from their granular contents. In Ooccidium oviforme from the liver of man and of the rabbit there are only four spores formed, which become sickle- shaped rods. FIG. 151.— ovifui-iw from the liver of the rabbit, magnified 550 diara. (after E. Leuckart). c, d, Stages of spore formation which have only been observed outside the cells. CHAPTER VII. CCELENTERATA (ZOOPHYTES).* Radially symmetrical animals with a body composed of cells. They have a body-cavity which serves alike for circulation and digestion (gastrovascular space). Amongst the Ca-lenterata we meet for the first time with organs and tissues composed of cells. In addition to the external and internal epithelium, cuticular, calcareous, and silicious structures, as well as muscles, nerves, and sense-organs are very generally present. On the other hand, the internal surface of the body is not differ- entiated into organs of circulation and digestion distinct from each other. The vegetative processes are performed by the internal sur- face of the gastric cavity, the gastrovascular space, of which the central part functions as stomach and intestine, the peripheral as vascular system. R. Leuckart was the first to recognise the importance of these characters, and made use of them t
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