Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 FIG. 317.—Quite young Si- piincnliiK still without ten- tacles (after B. Hatschek). O, mouth ; A, anus ; US, ventral cord; JV, nephri- dhim (brown tube) ; <?, ceiebral ganglion; B, apical plate; A, anus ; PoW, postoral circle of cilia; N, kidney. The cephalic and ventral plates soon grow together. The mesodermal bands split into somatic and * Compare especially B. Hatschek.

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