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ContributioD to the knowledge of the Plaeentation of the Cape Goldmole (Chrysochloris)

BY

Dr. DAN. DE LANGE Jr.

(With plate IV—VII).

Setting in order the literary inheritance of late prof. A. A. W. Hubrecht I found some interesting notes upon two series of sections through young uterine swellings of Chrysochloris probably made bij Mr. Arthur Willey of Montreal. These notes directed my attention to the plaeentation of this insectivore. Therefore as prof. Max Weber asked my collaboration to the memorial number of „Bijdragen tot cle Dierkunde" for Dr. Kerbert's seventieth anniversary, I resolved, after cutting some more series of slightly older stage, to investigate this subject in order to come to some provisional conclusions.

The Embryological Institute at Utrecht disposes of some ten uteri of Chrysochloris, five or six of which are pregnant, while the remaining are in virginal or puerperal conditions. The diameter of the swellings ranges from 5 to 18 mM. Chrysochloris possesses a pronounced uterus duplex and in all pregnant objects there is a uterine-swelling on both sides.

I. Youngest stage of the collection (N°. 2a of the, catalogue), diameter 5 mM.

The series is cut transversal to the main direction of the uterus and begins at the vaginal side of the swelling. Fig. la represents one of the first sections of the gestationsack drawn in a low power. The mesometrical side of the uterine mucosa is strongly swollen and shows numerous uterine glands (u. g.) and rather numerous bloodvessels (b.v.) of small diameter with distinct endothelium (vide Fig. 1 b i. e. a part of Fig. 1 a drawn under a high power). In this mucosal thickening a deep groove is present pointing to the root of the mesometrium (mes. gr.) and dividing the thickening into two not exactly equal parts. The anti-mesometrical portion of the uterine mucosa is thin, possesses a few glands and is almost devoid of bloodvessels. The uterine epithelium-cells are throughout highly cylindrical. The swollen condition of the mucosa at the mesometrical side is the normal one, the mucosa of virginal or regenerate uteri presenting a very thick layer with rather numerous glands, the cavum uteri being relatively small but showing very deep grooves. The thinning of the mucosal layer at the opposite side is caused by pregnancy. The reader will observe the important thickness of the muscularis mucosae of which only the inner layer of circular muscle-fibers is drawn (compare fig. la, with figg. 2, 3, 5 and 6).

As the wall of the germbladder appears these cushions of the uterine mucosa diminish in height, at first on the left side afterwards on the right side, while on the whole circumference the uterine mucosa becomes thinner. The result is that the mucosal wall of

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