THE J'L.trEyTA. 



89 



leJons and the tinest caruncles. It may here be mentioned that the 

 ovum of the Cow in the first week of pregnancy is smooth. Franck 

 has never been able to discover the vascular semi-detached caruncles 

 which are afterwards developed through the prolonf:;ation of the blood- 

 vessels ; though they are found in the Canine species. He has, how- 

 ■ever, obsen'ed definitely-formed vascular chorion-cotyledons between 

 the fourth and sixth weeks of pregnancy. The interposed cotyledons 

 obsen'ed by Franck have been noticed by other anatomists. Birnbaum 

 mentions them, but he is in error with regard to their development, 

 inasmuch as he believed that they arose from the uterine glands, which 

 is certainly not the case. The chorial tufts penetrate the uterine 





Fig. 54. 

 F(KTAi. Portion ok Placenta Pu.kvia. 

 n, n, Newly-fornifd F<ftal Placenti Pripvia, a Plactntule havintj been dcvc- 

 lopt-d on the Internal ()•»; f>, Blood-cli)t and portion of F<i'tal Membranes 

 which lay in thu t>3 ; r. Chorion. 



mucosa by four digitations, fixing themselves in the so-called simple 

 follicles, according to Franck.^ 



This excellent authority also points out, with regard to this circum- 

 stance, that in the vicinity of the uterine glands there are found small 

 follicles which are nearly always unobserved. The connection between 

 these chorial tufts and the uterine mucosa is extremely slight. 



At a later period of pregnancy, there appear other caruncles in the 

 form of foetal tufts and cotyledons, which the previously developed and 

 prominent maternal cotyledons and caruncles lie opposite to and in 

 contact with. The reason for this fact is to be sought for in the 

 circumstance, that the foetal caruncles pass into the most developed 

 ' DtiUjiche ZeUfchriJl j'tir Thiennediciii. 



