Genito-urinary Aiyparatus of the Mala Porpoise. 121 



the anterior and posterior ends of the testis they formed 

 agglomerations, of which the former was the larger. At the 

 hinder end of the testis the epididymis was replaced by the 

 vas deferens, a tube of larger calibre, although still greatly 

 convoluted. It turned outwards and slightly forwards upon 

 the ventral wall of the abdomen, under cover of (ix.y external 

 to) the peritoneum. In this manner the vas reached the lateral 

 re-entrant angle of the abdominal wall, where it became 

 obscured by the vascular plexus already referred to. Con- 

 siderably increased in size, but still greatly convoluted, it 

 turned directly backwards, and having reached beyond (i.e., 

 behind) the digital peritoneal pouch, the convolutions again 

 formed a large agglomeration. It then turned round the 

 hinder blind end of this peritoneal recess and passed forwards 

 upon the dorsal abdominal wall external to the innominate 

 bone, thus forming a loop, and being still convoluted. Gradu- 

 ally inclining inwards, it reached the inlet of the pelvic 

 cavity at a point nearly 4 cm. in front of the hinder end of 

 the loop. The convoluted character now ceased, and the vas 

 deferens crossed superficial to, first the hypogastric artery 

 and then the ureter, whereupon it again turned backwards 

 along the outer and ventral aspects of the pelvic cavity. 

 Then running inwards across the dorsal surface of the 

 urinary bladder under cover of the peritoneum, which in 

 this position was so arranged as to provide the two vasa 

 deferentia with a peritoneal miniature of the uterine broad 

 ligament, these ducts approached each other in the mesial 

 plane, and continued their course forwards upon the non- 

 peritoneal basal aspect of the urinary bladder. Here each 

 vas deferens presented a fusiform dilatation, with correspond- 

 ing increase in the size of the lumen. There was no trace of 

 vesiculae seminales, but the two dilated vasa became firmly 

 adherent to each other, although each retained its inde- 

 pendent lumen. Thus situated, the vasa deferentia disap- 

 peared between the neck of the bladder and the prostate 

 gland, and finally opened into the urethra by piercing its 

 dorsal wall. 



The position and relations of the testes and their ducts are 

 of great morphological interest, indicating, as they do, so 



