. The elasmobranch fishes . UTERUS Fig. 267. A. Section of uterine lining to show villi and blood supply, Squahis. B. Transverse section through a single villus, Acanthias. (From Brinkmann.) cp., capillaries; , terminal artery; vi., villus. We have said that the uterus is much more highly developed in those sharks which give birth to living young; for in these it serves as a place in which a consider- able part of the development is undergone. Such a uterus is that of Squalus sucklii {ut., fig. 253) in which it may be a greatly enlarged sac with well de- fined boundaries. Anteriorly the ut
. The elasmobranch fishes . UTERUS Fig. 267. A. Section of uterine lining to show villi and blood supply, Squahis. B. Transverse section through a single villus, Acanthias. (From Brinkmann.) cp., capillaries; , terminal artery; vi., villus. We have said that the uterus is much more highly developed in those sharks which give birth to living young; for in these it serves as a place in which a consider- able part of the development is undergone. Such a uterus is that of Squalus sucklii {ut., fig. 253) in which it may be a greatly enlarged sac with well de- fined boundaries. Anteriorly the uterus of Squalus is separated from the for- ward part of the oviduct by a well defined oviducal valve (fig. 266) which is a wavy constriction with a very narrow lumen effectively closing the uterus to the upper part of the oviduct.
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