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Metschnikoff. "Observations sur le developpement de quelques animaux (Bothriocephalus proboscideus). " Bull. Acad. Imp. St Petersboiirg, Vol. XIII. 1869. (229) W. Salensky. "Ueb. D. Bau u. D. Entwicklungsgeschichte d. Amphi- lina. " Zeit. F. Wiss. Zool. , Vol. Xxiv. 1874. (230) Von Siebold. Burdach's Physiologie. (231) R. Von Willemoes-Suhm. "Helminthologische Notizen. " Zeit. F. Wiss. Zool. , Vol. Xix. Xx. Xxn. 1869, 70 and 73. CHAPTER VIII. ROTIFERA. FOR many reasons a complete knowledge of t...he ontogeny of the Rotifera is desirable. They constitute a group which retain in the trochal disc an organ common to the embryos of many other groups, but which in most other instances is lost in the adult state. In the character of the excretory organs they exhibit affinities with the Platyelminthes, while in other respects they possibly approach the Arthropoda (e. G. Pedalion ?). The interesting Trochosphcera cequatorialis of Semper closely re- sembles a monotrochal polychaetous larva. Up to the present time our embryological knowledge is mainly confined to a series of observations by Salensky on Bracldonns urceolaris, and to scattered statements on other larval forms by Huxley, etc.
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