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Segmentation is, as in other richly yolked eggs, incomplete, confined to the germinal disk at the opercular pole.

In this work, in the large folio form, beautiful representations are given of the author’s valuable observations on human embryology, and on that of various mammals, birds and fishes, and of the author’s 327 discovery in 1847 of the process of partial yolk segmentation in the germinal disk of the fowl’s egg during its descent through the oviduct, and his observations on the same phenomenon in fishes and mammals.

Germinal disk. layers, the. scheme of the. spot, the. vesicle, the.

These "eating yelk-cells" are found in large numbers in the food-yelk of the Selachii, especially in the yelk-wall—the border zone of the germinal disk in which the embryonic vascular net is first developed.

But this small white "germinal disk" is now further developed, and is really the gastrula of the chick.