Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 Fio. 42.—Stylonychia mytilns (after Stein) viewed from the ventral surface; Wz, adoral zone of cilia; C, contractile vacuole; N,nucleus; AT/,nucle- olus (paranucleus); A, anus. r—6 FIG. 43.—Longitudinal section through the body of an Anthozooid (Octactinia). M, stomachic tube with the mouth open- ing in the centre of the feather-like tenta- cles ; Jiff, mesenteric folds; G, genital organs. Among the animals with cellular differentiation (Metazoa), the
Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 Fio. 42.—Stylonychia mytilns (after Stein) viewed from the ventral surface; Wz, adoral zone of cilia; C, contractile vacuole; N,nucleus; AT/,nucle- olus (paranucleus); A, anus. r—6 FIG. 43.—Longitudinal section through the body of an Anthozooid (Octactinia). M, stomachic tube with the mouth open- ing in the centre of the feather-like tenta- cles ; Jiff, mesenteric folds; G, genital organs. Among the animals with cellular differentiation (Metazoa), the internal cavity of the body in the Crelenterata (morphologically identical with the alimentary cavity and not with the body cavity of other animals) functions as a digestive cavity, and its peripheral adially arranged portions as a system of vascular canals (gastro-
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