482 WILLIAM NICOLL. 



The body is flat and of oval outline. The cuticule is unarmed. The 

 length of the body (slightly pressed) is -95 mm., and the maximum 

 breadth in the middle, -52 mm. The sub-terminal oral sucker has a 

 diameter of -105 mm., and the ventral sucker, situated a little in front 

 of the middle of the body, measures -15 mm. There is a small pharynx, 

 contiguous in the oral sucker. The oesophagus is two or three times as 

 long as the pharynx, the intestinal bifurcation taking place about midway 

 between the pharynx and the genital aperture. The intestinal diverticula 

 are very narrow, they extend into the posterior part of the body, but 

 their termination is obscured by the uterus. 



The genital aperture is median, and lies about -15 mm. in front of the 

 ventral sucker. There is a small, stout cirrus-pouch lying entirely in 

 front of but almost touching the ventral sucker. At its posterior end it 

 contains a small, simple vesicula seminalis. This is followed by a short 

 inflated pars prostatica. The ductus ejaculatorius is short and wide and 

 its walls are thrown into irregular folds, resembling the condition in 

 Steringophorus. The testes are symmetrically situated, one on each side 

 of- the body, immediately behind the ventral sucker. They are globular 

 or elongated oval bodies a little larger than the ventral sucker. 



The ovary is situated between the testes, directly behind the ventral 

 sucker. It is globular and somewhat smaller than the testes. The yolk 

 glands occupy the sides of the body in front of the ventral sucker, and 

 they extend from the middle of the sucker to the level of the oesophagus. 

 The yolk ducts run backwards and unite behind the ovary. The uterus is 

 confined entirely behind the testes. It forms a large number of narrow 

 convolutions chiefly in a longitudinal direction. The initial convolutions 

 are on the left side of the body, where the eggs are almost colourless. 

 Towards the other side the colour gradually deepens. The vagina is 

 apparently simple. The numerous eggs measure •020--024x -014- 

 •017 mm. 



In Stossich's figure the intestinal bifurcation is much nearer the ventral 

 sucker than is the case in my specimens ; the testes are much larger 

 and the cirrus-pouch is not shown. The genital aperture also is described 

 as being immediately behind the pharynx. How far these discrepancies 

 are due to errors of observation it is impossible to say, as I have had no 

 opportunity of examining Stossich's original material. 



This species undoubtedly represents the type of a distinct genus of 

 the family FELLODISTOMIDAE and the sub-family Fellodistominae. 

 Its general build rather suggests an afiinity with the Monorchidae, but 

 the structure of the cirrus-pouch and vagina excludes it from that family. 



