Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 PORIFERA. 0 remain in the niesoderni, 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.—Euapoiigia qfficinalis titlriuficu, with a numuer of i r oscula, O (after Fr. E. Schulze). known tor the Syconidce from the investigations of Fr. Schulze and Barrois. a

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