BY J AS. P. HILL. 61 



tissue surrounding the posterior end of the former, and situated 

 between the lateral vaginal canals and above the urethi'a. The 

 stalks extend back in the pseudo-vaginal passage, surrounded by 

 dense connective tissue, over certainly one-third of the length of 

 the urogenital strand. Posteriorly they are looped upon them- 

 selves, and some distance before they disappear come to lie quite 

 free in a large cleft occupying almost the entire area between the 

 urethra below and the lateral vaginal canals at the sides. They . 

 extend altogether through over six hundred sections of medium 

 thickness, behind the posterior end of the common median ^'agina. 

 The stalks measure in diameter '36 mm. by -26 mm. They are 

 greatly degenerate, presenting a reticulate appearance, with 

 deeply staining small fragmentary nuclei in the meshes. The 

 positions of the allantoic vessels are just recognisable in some 

 sections. The two stalks lie close together, but not in contact, 

 since they are separated by a thin layer of connective tissue, 

 which also forms a common adventitious sheath around them. 

 And not only are the stalks invested and separated by connective 

 tissue, l)ut connective tissue corpuscles have now definitely 

 invaded the degenerate tissue of the stalks. Posteriorly the 

 stalks are found to have been infiltrated by maternal blood, but 

 this is the only specimen in which I have found blood clots in 

 such a position. The extravasted blood so abundanth^ present in 

 and around the pseudo-vaginal passage of the previous specimen 

 has now almost entirely disappeared. 



Beyond the points of termination of the two stalks, the pseudo- 

 vaginal passage can be traced on right up to near the point of 

 opening of the lateral canals into the urogenital sinus. In the 

 extreme posterior part of its course the passage is a much less 

 definite one, consisting merely of a series of irregular clefts. 

 Serial sections passing through the junction of the ui^ogenital 

 strand with the sinus fail to reveal the presence of any inter- 

 ruption in the lining of the latter. I am, therefore, unable to 

 state definitely the actual position of the aperture by means of 

 which the young reach the urogenital sinus. 



That the present female had boi-n 3''oung on at least one previous 

 occasion, the following facts almost certainly demonstrate. 



