. Journal of morphology. Figs. 113 and 114 Lower hemispheres of two eggs of Cryptobranchus alle-gheniensis in an early gastrida stage, showing cleavage furrows. The verticalaxis as determined by gravity lies at the center of each figure; the vegetal pole,at the intersection of the first two cleavage furrows, is about 7 degrees above thevertical pole. figure 113 the first cleavage furrow lies approximately in themedian plane of the gastruhi; in figure 114 it is at right angles to this plane. Cam-era drawings, finished under the binocuhir, from jjreserved material. X 8. The blastopore is first d
. Journal of morphology. Figs. 113 and 114 Lower hemispheres of two eggs of Cryptobranchus alle-gheniensis in an early gastrida stage, showing cleavage furrows. The verticalaxis as determined by gravity lies at the center of each figure; the vegetal pole,at the intersection of the first two cleavage furrows, is about 7 degrees above thevertical pole. figure 113 the first cleavage furrow lies approximately in themedian plane of the gastruhi; in figure 114 it is at right angles to this plane. Cam-era drawings, finished under the binocuhir, from jjreserved material. X 8. The blastopore is first distinguished as a shallow irregular andbroken horizontal groove two or three millimeters in length,lying about 15 degrees below the equator. It occurs at the upperlimit of transitional cells between micromeres and macromeres,and its immediate site is distinguished by a rather abrupt demar-cation between micromeres and distinctly larger transitionalcells. The groove is started, not by a lining-up of cells and theunion
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
