Excerpt from The Quarterly Journal of Microscopical Science, Vol. 64: April, 1879
The following paper is divided into three sections. The first of these records the existence of certain structures in the embryo chick, which eventually become in part the abdominal opening of the Mullerian duct, and which, we believe, correspond with the head-kidney, or "Vorniere" of German authors. The second deals with the growth and development of the Mullerian duct. With reference to this we have come to the conclusion that the Mullerian duct does not develop entirely independently of the Wolffian duct. The third section of our paper is of a more general character, and contains a discussion of the rectifications in the views of the homologies of the parts of the excretory system in Aves, necessitated by the results of our investigations.
We have, as far as possible, avoided entering into the extended literature of the excretory system, since this has been very fully given in three general papers which have recently appeared by Semper, furbringer, and by one of us.
All recent observers, including Braun for Reptilia, and Egli for Mammalia, have stated that the Mullerian duct develops as a groove in the peritoneal epithelium, which is continued backward as a primitively solid rod in the space between the Wolffian duct and peritoneal epithelium.
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