A HERMAPHRODITE DOGilSU. 219 



however, conclusively disproves any such homology, for it had 

 both oviducts well developed and also the sperm-sac of the 

 right side. 



The ureter of each side was attached to the inner side of the 

 vesicula seminalis, slightly in front of the point where the latter 

 became united with the wall of the oviduct ; behind this point 

 it was united also with the wall of the oviduct. The ureter 

 opened into the vesicula seminalis of its own side immediately 

 before the latter opened into the oviduct. The small duct from 

 the posterior end of the kidney opened separately into the vesicula 

 seminalis on a level with the opening of the ureter. 



It will be seen that, except for the absence of sperm-sacs, this 

 animal had the complete genital systems of both male and female, 

 and thus showed the completion in the adult of the primitive 

 embryonic condition in which both male and female genital ducts 

 are potentially present. 



EXPLANATION OF THE PLATES. 



Plate I. 



Fig. 1. Gonads, from ventral surface : alioub natural size. 



2. Urinogenital ducts : semi-diagrammatic : about natural size. 



Plate 1L 



Fig. 3. Diagram of posterior part of urinogenital ducts. Ventral view. 



Figs. 3 a, 3 6, & 3c. Diagrams of transverse sections of urinogenital ducts at a, b, 



& c respectively. 

 Fig. 4. Anterior end of right gonad, dissected to show lierraaphrodite character of 



that region. Ventral view. The gonad lias been split along the in)ier 



edge, and the ventral halt turned back to show tie ovarian region : about 



H natural size. 



16^ 



