THE URINOGENITAL SYSTEM 



193 



In Amphibia, Eeptiles, and Birds, the Miillerian ducts in the 

 female remain separate throughout life, and this is also the case 

 in the lowest living Mammals (Monotremata), which are partly 

 on this account called the Ornithodelphia. In all Mammals above 

 the Monotremes, however, they early become to a lesser or greater 



od. 



FIG. 104. A to C, DIAGRAMMATIC REPRESENTATIONS OF THE CHIEF TYPES OF UTERDS 



OCCURRING IN THE PLACENTAL MAMMALS. A, UTERUS DUPLEX ; B, UTERUS 



BIPARTITUS ; C, UTERUS SIMPLEX ; D, URINOGENITAL APPARATUS OF A FEMALE 

 MUSTELINE ; E, THE SAME OF THE HEDGEHOG, THE FORMER WITH EMBRYOS (* *) 

 IN THE UTERUS. 



od., oviduct (Fallopian tube) ; ut., uterus ; ut'., cornua uteri ; ut"., corpus uteri ; vg., 

 vagina; ot. , ostium tubse ; gl. , accessory gland; r., rectum; s.ug., sinus urino- 

 genitalis ; re 1 ., kidney ; re"., suprarenal body ; vr., ureter; bl., bladder. 

 Aufl. II. p. 981) a paired origin from the bases of the mesonephrio ducts, and in 

 respect to this it exactly harmonises with, and would appear to represent in a 

 confluent form, the human vesiculse seminales. The fact that among other Rodents I 

 it is represented (e.g. Guinea-Pig) by a pair of elongated cceca, or (e.g. Muridae) 

 by two folded and more glandular diverticula, having the detailed relationships of the 

 seminal vesicles of the other mammalia, fully bears out this view. G. B."H.] 







