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 POBIFEIiA. 219 0 remain in the mesoderm, and there undergo their development. It is only later that the ciliated embryos or larvae fall into the canal system, pass out, and attach themselves, to de- velop into a young sponge. The embryonic de- velopment among the calcareous sponges is most accurately FIG. 165.—Ewpongia officinalis , with, a number of ,. oscula, O (after Fr. E. Schulze). known for the Sycvnidc
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 POBIFEIiA. 219 0 remain in the mesoderm, and there undergo their development. It is only later that the ciliated embryos or larvae fall into the canal system, pass out, and attach themselves, to de- velop into a young sponge. The embryonic de- velopment among the calcareous sponges is most accurately FIG. 165.—Ewpongia officinalis , with, a number of ,. oscula, O (after Fr. E. Schulze). known for the Sycvnidce from the investigations of Fr. Schulze and Barrois. a,
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