. Anatomischer Anzeiger. Anatomy, Comparative. 4. Figs. 1—8. The maturation and cleavage in dextral and sinistral snails; R dex- tral forms, L sinistral ones. In Fig. 1, fp is the free pole and ap the pole of attach- ment, the head of the arrow indicating the place at which the polar bodies will probably form in each case. In Figs. 3—8 the arrows indicate the direction of division; the quadrants of the egg are labelled with the letters A, B, C, D; the Mesomere with the letter M. In Figs. 1, 2 and 5 the chief axis of the egg lies in the plane of the paper; in Figs. 3, 4, 6, 7, 8 it is perpendic

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. Anatomischer Anzeiger. Anatomy, Comparative. 4. Figs. 1—8. The maturation and cleavage in dextral and sinistral snails; R dex- tral forms, L sinistral ones. In Fig. 1, fp is the free pole and ap the pole of attach- ment, the head of the arrow indicating the place at which the polar bodies will probably form in each case. In Figs. 3—8 the arrows indicate the direction of division; the quadrants of the egg are labelled with the letters A, B, C, D; the Mesomere with the letter M. In Figs. 1, 2 and 5 the chief axis of the egg lies in the plane of the paper; in Figs. 3, 4, 6, 7, 8 it is perpendicular to the plane of the paper. Fig. 8 represents a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anatomische Gesellschaft. Jena : G. Fischer

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