TREMATODES OF AUSTRALIAN BIRDS. 245 



The genital pore is very far forward, right in front of the 

 pharynx, in the middle line, ventral to the prepharynx. In 

 figure 25 it is shown as lying just to the side of the pre- 

 pharynx which has become a little displaced to the right 

 in the specimen from which the drawing was made, through 

 pressure. The cirrus sac which is almost completely filled 

 up by the vesicula seminalis is somewhat pear-shaped, with 

 the anterior end elongated. Posteriorly it reaches a level 

 some distance behind the intestinal fork. 



The testes are exceedingly large, roughly rounded, with a 

 surface irregular through shallow indentations. The oval 

 ovary, with its long axis transversely placed, lies between 

 them but nearer the posterior, several loops of the uterus 

 intervening between it and the anterior testis. The three 

 gonads are placed in a straight line slightly inclined to the 

 longitudinal axis of the body. The anterior testis, 1*96 x 

 1*76 mm., is somewhat smaller than the posterior, 2*28 X 

 1*96 mm., while the ovary, 0*97 x 0*-776 mm., is a good deal 

 smaller than either. 



The yolk glands are mainly on the outer sides of the 

 intestinal limbs, spreading very little on their dorsal and 

 ventral surfaces. In front they do not reach the level of 

 the intestinal fork, and behind are separated by a wide 

 interval. The follicles are oval in shape and fairly variable 

 in size, from 0*054 - 0*133 mm. long, by 0*043x0*085 mm. 

 wide. 



The uterus is exceedingly long and voluminous, and the 

 loops run for the most part right across the body, reaching 

 well into the lateral fields between the intestinal limbs and 

 the lateral edges, but some of the loops run from the sides 

 to the middle line only, as in Cycloccelum. None of the 

 loops pass further back than the anterior border of the 

 posterior testis. 



