. Journal of morphology. Figs. Ill and 112 Lower hemispheres of two eggs of Cryptobranchus alleghe-niensis in Stage 10, showing cleavage pattern. The embryo shown in figure 112is slightly older than the one represented in figure HI. Camera drawings frompreserved material. In each egg, the lower pole as determined by gravity liesat the center of the figure; the vegetal pole, at the intersection of the first twocleavage furrows, is slightly above this point. The upper part of each figure rep-resents the side on which the blastopore is to appear. X 7. Usually, the cleavage pattern of the lower he
. Journal of morphology. Figs. Ill and 112 Lower hemispheres of two eggs of Cryptobranchus alleghe-niensis in Stage 10, showing cleavage pattern. The embryo shown in figure 112is slightly older than the one represented in figure HI. Camera drawings frompreserved material. In each egg, the lower pole as determined by gravity liesat the center of the figure; the vegetal pole, at the intersection of the first twocleavage furrows, is slightly above this point. The upper part of each figure rep-resents the side on which the blastopore is to appear. X 7. Usually, the cleavage pattern of the lower hemisphere retainsenough of its earlier bilateral symmetry to enable one to distin-guish first and second cleavage furrows. The vegetal pole, sinceit occurs at the intersection of the first two cleavage furrows,may in most cases still be determined quite accurately and con-veniently by means of the cleavage pattern. As shown in figures111 and 112, the vegetal pole is excentrically located in the areaoccupied by the macrome
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
