. On the anatomy of vertebrates [electronic resource] . , , Jn of impregnation. its opacity from the clearer part of the yolk, ib. A. In the Perch it presents a greyish, in the Pikea yellowish, tint. The germinal vesicle, which had previouslybecome filled and obscured by granules and granular corpuscles,breaks up to form, or contribute to form, the germinal layer,which now becomes more circumscribed and distinct: the processof segmentation, which follows that of impregnation, is limitedto the germinal portion of the yolk, with which it is the Perch the ova assume a greenish tin
. On the anatomy of vertebrates [electronic resource] . , , Jn of impregnation. its opacity from the clearer part of the yolk, ib. A. In the Perch it presents a greyish, in the Pikea yellowish, tint. The germinal vesicle, which had previouslybecome filled and obscured by granules and granular corpuscles,breaks up to form, or contribute to form, the germinal layer,which now becomes more circumscribed and distinct: the processof segmentation, which follows that of impregnation, is limitedto the germinal portion of the yolk, with which it is the Perch the ova assume a greenish tint shortly after impreg-nation. There is reason to suppose that impregnation of theeggs of both Sharks and Rays takes place in the ovarium or thecontiguous part of the oviduct, for they become enveloped in thedense albuminous secretion of the nidamental glands after havino-passed that part, which covering would prevent the subsequentinfluence of the spermatozoa. § 115. Developement of Fishes.—The germinal layer consists of1 Cited in cccviii. p.
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