Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 r6 OIlGA» D£VELOPMI;^â T OF AMMALS !>' GENERAL. opeuings which are usually common to the generative organs; they consist essentially of a number of coiled tubes, which in the more primitive types of Vertebrates have a ciliated funnel-shaped opening into the body cavity (Dogfish embryo, fig. 71). The individual tubules of which the verte irtr JZz^

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