Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FIG. 6.—A flagellate Infusorian, Chilimonas paramcecium (after Biitschli). n, nucleus; oe, oesophagus; v, contractile vac- uole. FIG. 7.—A ciliated Infusorian, Stylo- nichia mytilus, in process of division (after Stein), a, anus; cv, contractile vacuole; m, mouth; ma, macronucleus; mi, micronucleus; nm, new mouth. cases the conjugating individuals are equal in size and the union is temporary, the essential feature being an exchange of nuclear material. Here we have the lowest expression
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FIG. 6.—A flagellate Infusorian, Chilimonas paramcecium (after Biitschli). n, nucleus; oe, oesophagus; v, contractile vac- uole. FIG. 7.—A ciliated Infusorian, Stylo- nichia mytilus, in process of division (after Stein), a, anus; cv, contractile vacuole; m, mouth; ma, macronucleus; mi, micronucleus; nm, new mouth. cases the conjugating individuals are equal in size and the union is temporary, the essential feature being an exchange of nuclear material. Here we have the lowest expression of sexuality, but without differentiation of sex. With others the conjugating individuals are un- equal in size and the fusion is permanent, the resulting
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