THE URINOGENITAL SYSTEM 193 
In Amphibia, Reptiles, 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 
Fig. 104.—A to C, DIAGRAMMATIC REPRESENTATIONS OF THE CHIEF TYPES OF UTERUS 
OCCURRING IN THE PLACENTAL MammaLs. A, UTERUS DUPLEX; B, UTERUS 
BrpaRtitus ; C, UTERUS SimeLEx ; D, URINOGENITAL APPARATUS OF A FEMALE 
MUSTELINE; E, THE SAME OF THE HEDGEHOG, THE FORMER WITH Embryos (* *) 
IN THE UTERUS. 
od., oviduct (Fallopian tube) ; wt., “uterus ; wt’., cornua uteri; wt’., corpus uteri; vg., 
vagina; o¢., ostium tube; gl., accessor land; 7., rectum; s.uwg., sinus urino- 
2 9 6 Z b) b} 5) $) >) b] 
genitalis ; re’., kidney ; re’’., suprarenal body ; wr., ureter; b/., bladder. 
Aufl. II. p. 981) a paired origin from the bases of the mesonephric ducts, and in 
respect to this it exactly harmonises with, and would appear to represent in a 
confluent form, the human vesicule seminales. The fact that among other Rodents 
it is represented (e.g. Guinea-Pig) by a pair of elongated cceca, or (e.g. Muride) 
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.] 
O 
