The Journal of experimental zoology . l62 Edwin G. Conklin. B^-^ into B^^ and B*^ is almost at right angles to its normaldirection. In other cases, as is shown in Fig. 24, this cleavage isnormal in direction, and I am, therefore, of the opinion that thecondition shown in Fig. 17 and the later stage of this same eggshown in Fig. 19 may be due to some slight injury to the developinghalf of this egg. In Fig. 18, which is a dorsal view of the same eggin the same stage as Fig. 17, the cells A**-^ and A^ have moved intoward the median plane as compared with Fig. 16, though in thisrespect, also, the
The Journal of experimental zoology . l62 Edwin G. Conklin. B^-^ into B^^ and B*^ is almost at right angles to its normaldirection. In other cases, as is shown in Fig. 24, this cleavage isnormal in direction, and I am, therefore, of the opinion that thecondition shown in Fig. 17 and the later stage of this same eggshown in Fig. 19 may be due to some slight injury to the developinghalf of this egg. In Fig. 18, which is a dorsal view of the same eggin the same stage as Fig. 17, the cells A**-^ and A^ have moved intoward the median plane as compared with Fig. 16, though in thisrespect, also, the corresponding stage shown in Fig. 24 is quitenormal. This shifting of the anterior dorsal cells toward themedian plane is shown again at the next cleavage (the sixth), ofthis egg. (Fig. 20.) The seventh cleavage, which is shown in Figs. 25 and 26, is alsonormal except for the direction of a few of the divisions. Thecells which constitute the yellow and gray crescents are in allrespects like the right half of a normal egg. However the
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
