350 EDENTATA. 



form they assumed was exactly that of the two-horned uterus, with the horns 

 however, side hy side, or only slightly divergent. On floating the memhranes 

 thus distended into the opened uterus, the right horn was found to he fully 

 occupied hy the right sac, and the portion helow the line of union of the 

 sacs exactly filled up that portion of the uterine cavity lying ahove the os and 

 formed hy the common cavity of the uterus and a portion of the left horn. On 

 forcing the dilated left sac into the left horn through the opening and channel, 

 that cavity was also filled with its sac of membranes. The line of union of the 

 two sacs corresponded to the opening into the left horn, and the space between 

 the sacs at this point was occupied by the crescentic free margin of the septum 

 dividing the horns at that point. The portion of the sac of the membranes which 

 filled up the common cavity of the uterus had that portion which was opposed 

 to the OS uteri internum smooth, but bearing a short free fringe or fold on the surface 

 of the chorion ; commencing slightly dorsally towards this pole and then bending 

 off at an obtuse angle, it ran forwards immediately towards the right side of the Hue 

 of junction of the sacs of the left and right horns, where it bifurcated, one branch 

 running for a short distance along the sac of the right horn, and the other and more 

 prominent branch along the sac of the left horn. The fold on the pole was covered 

 with fine villi. Professor Turner failed to detect the bare area opposite the os uteri 

 internum in the Manis membranes originally described by Sharpey, but they do 

 not appear to have been in a satisfactory condition. It is improbable that this bare 

 patch will be found to characterise the membranes of all bi-horned uteri with 

 a diffuse placentation. The remaining bare parts and villous areas were well 

 seen in the inflated membranes, and a better idea was gained of their distribution 

 than from the uterine surface. The bare tracts were seen to be along the direction 

 of the long axis of the sac, but they were not at all numerous, there being 

 only about eight originating in an irregular way from the pole opposite the os uteri 

 internum. These bare tracts were of various widths, with a slight curvature 

 along the sac, and they were more or less broken up by isolated offshoots 

 from the intervening villous areas which were much broader than the bare 

 tracts. As they were traced along the sac of the right horn, the bare tracts 

 became wholly interrupted, and isolated bare areas of various forms were thus pro- 

 duced and at different intervals, the chorion being much more villous than bare- 

 Some of these bare patches were branched, others were linear ; some were elongated 

 ovals, and others round. In the portion of the sac immediately opposite to the os 

 uteri internum there was a large bare tract nearly circular communicating with 

 other bare areas around it and nearly enclosing a round villous area with a bare por- 

 tion in its centre. The "Fallopian extremity of the sac was sparsely covered 

 with villi, which were less developed than on the other parts, but as the portion 

 immediately around the Eallopian end of the sac was injured by rupture, I am not 

 in a position to say what its characters were. The broad bare tract or band described 

 by Sharpey corresponded in this, as in Orcella, Tlatanista and the Tapir, to the 

 course of the great vessels of the cord. It was prolonged forwards to near the 



