Journal of morphology . JO. Wilson, del. 622 WILSON. PLATE XXX. [Figs. 13 to 18, from a living specimen ; the others from preparations ; 270 diameters.] Figs. 13 to 18. Successive stages of a living embryo, viewed from the lowerpole, followed from the undivided egg up to the 128-celled stage. Strict bilateralform //. The straight lines represent as nearly as could be determined the axisof the spindles in the stage following each figure. Fig. 13. 8-celled stage; 14, fourth cleavage; 15, i6-celled stage (cf. Figs. 21,27); 16, 32-celled stage. Fig. 17. 64-celled stage.
Journal of morphology . JO. Wilson, del. 622 WILSON. PLATE XXX. [Figs. 13 to 18, from a living specimen ; the others from preparations ; 270 diameters.] Figs. 13 to 18. Successive stages of a living embryo, viewed from the lowerpole, followed from the undivided egg up to the 128-celled stage. Strict bilateralform //. The straight lines represent as nearly as could be determined the axisof the spindles in the stage following each figure. Fig. 13. 8-celled stage; 14, fourth cleavage; 15, i6-celled stage (cf. Figs. 21,27); 16, 32-celled stage. Fig. 17. 64-celled stage. Note the extreme lateral position of C^ D^ and theequality of D and d.^ First appearance of cross-furrow by displacement. Fig. 18. 128-celled stage. Restoration of bilateral symmetry. Cross-furrow. Fig. 19. Fourth cleavage, radial form, upper pole. Fig. 20. i6-celled radial form, upper pole. Fig. 21. The same embryo from the lower pole. Figs. 22 to 24. Three examples of modified bilateral forms, fourth cleavage. Joiirii. Morph.
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
