1919] 



Cort: A New Distome from Rana, aurora 



287 



granular and in the living specimens are dark grey in color in contrast 

 with the other structures of the cirrus sac. The cirrus is about as long 

 as the seminal vesicle, is thick walled and can be protruded. At its 

 posterior extremity the cirrus sac receives the ducts from the testes 

 (v.e.), which unite into a very short vas deferens (v.d.) just before 



Pig. 2. End ducts of reproductive systems of Margeana calif orniensis ; c, 

 cirrus; g.p., genital pore; met., metraterm; p.g,, prostate glands; pr., prostate 

 region; s.v., seminal vesicle; v.d., vas deferens; v.e., vas efferens; u., uterus. 



enlarging into the seminal vesicle (s.v.). The testes (fig. 1, t.) are 

 large and, in the living animal, spherical except for the slight pro- 

 jections anteriorly at the points where the vasa efferentia (fig. 2, v.e.) 

 are given off. The testes are located at the same level in front of the 

 middle of the body and just behind the ventral sucker. Their size 

 varies with the size of the worm. In'the largest individuals (fig. 1, t.) 

 they fill almost four-fifths of the width of the body and have a 



