. Journal of morphology. cating individual differences in thechromosomes of many forms. There is frequently present close to the cell wall overlying thespindle a disc-shaped body with an irregular cross-striated struc-ture, which, from its probable mode of origin, I shall call the con-tact disc (see figs. 33 and 34). This disc takes the cytoplasmicstain, and seems to be of the same composition as the cell adjacent cell wall is slightly thickened and sometimes showsa cross-striation, reminding one of the zona radiata (compare the EMBRYOLOGY OF CRYPTOBRANCHUS 133 effect on the cell wall
. Journal of morphology. cating individual differences in thechromosomes of many forms. There is frequently present close to the cell wall overlying thespindle a disc-shaped body with an irregular cross-striated struc-ture, which, from its probable mode of origin, I shall call the con-tact disc (see figs. 33 and 34). This disc takes the cytoplasmicstain, and seems to be of the same composition as the cell adjacent cell wall is slightly thickened and sometimes showsa cross-striation, reminding one of the zona radiata (compare the EMBRYOLOGY OF CRYPTOBRANCHUS 133 effect on the cell wall of penetration by the spermatozoon, de-scribed later). The presence of the contact disc is uniformlyaccompanied by a deficiency of the spindle, which lacks an asterat the end nearest the disc. In a few cases there seems to be asmall amount of sphere substance underlying the contact inference seems to be that the contact disc is the product ofthe aster of the first polar spindle modified by contact with the
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
