MOEPHOLOGY OF THE HUMAN URINOGENITAL TRACT. 365: 



could ascertain, the cavity of this tumour cotnnmnicated with 

 no organ, and gave no secretion. It seemed to me to be scrotal 

 at any rate, with or without testicle, and I thought it best to 

 consider matters before removal. I could find no such case 

 recorded, and could advance no thorough explanation of its 

 nature. As the parents were greatly distressed at this strange 

 malformation, and as I was certain it had no communication, 

 with any organ or with peritoneum, I ultimately removed it,, 

 first transfixing and ligaturing the neck. The child did not; 

 suffer afterwards, and is now quite well. On laying open the 

 tumour, I found the cavity already alluded to, but nothing else 

 except fat and skin. 



On microscopical examination I was very much astonished to 

 find the cavity lined with Lieberkiihnian follicles, and no tes- 

 ticular tissue present. We have, therefore, to explain the strange 

 anomaly of such a rare and unusual condition. 



If we take Keibel's diagrams (figs. 1 and 2) of the lower end of 

 an early human foetus 3 mm. long, we see displayed the structure 

 known as the cloacal membrane. This is the anterior boundary 

 of the part of the primitive gut known as the entodermal cloaca, 

 from which, as I have already explained, the rectum and bladder 

 are formed by coronal partitions (figs. 6-9). This cloacal 

 membrane extends from the root of the navel back to the top of 

 the portion of the primitive gut, which atrophies usually. The 

 aberrant tumour I have just described seems to me to be the 

 persistent end-gut; and if this bo the case it is of importance as 

 helping to determine the posterior end of the cloacal membrane. 



The value of my case, if my view be right, is this, that it 

 establishes in the new-born child the posterior boundary to 

 which the cloacal membrane extends, viz., to the var^ina. It 

 also shows that the split clitoris is not a proof that the glans 

 develops from two halves originally. 



3. Two cases of transverse sejjtiun vagince dividing the va/jina' 

 info a loivcr third and upper tivn-thirds. — This is the rarer form 

 of so-called atresia hymenalis vaginae. We have the external 

 genitals developed normally, a hymen present as in one of my 

 cases .where the patient was a girl at puberty, with the vagina 

 apparently an inch long, and evident pressure symptoms and 

 retention of urine. When I saw her the .urinary retention^ had 



