STUDIES OX THE ECTOPARiSITIC TREMATODES OF JAP AX. 197 



dorsal, median or a lateral vaginal opening. With a pair 

 of egg-shaped or spherical suckers in the mouth-cavity. 



1. Axine heterocerca, n. sp. 

 (PI. VII, figs. 1, 2, 3, 4 ; PI. VIII.) 

 Bothj flat, about 10 mm. long, with a form roughly like that 

 of the blade of a Turkish sword, with a convex border behind. 

 Common (jeiiital opening situated a little behind the termination of the 

 oesophagus. Ocanj at the posterior end of the middle third of the 

 body, comparatively small, long, following in its general course the 

 three sides of a triangle, the a^iex of which is directed towards the 

 front end of the body, and making numerous smaller windings; its 

 exact form is as represented in fig. 1, PI. VII, and fig. 5, PI. ^"III. 

 Ocidiict arising from the ovary on the right side of the body, and bear- 

 ing a small seminal receptacle close to its origin, proceeds backwards and 

 towards the left, and is continued into the ootyp in the median line ot 

 the body. The uterus proceeds from the ootyp straight forwards and 

 opens into the genital atrium. Vaginal opening single, dorsal, median, 

 situated as far behind the common genital opening as this is behind 

 the pharynx. The vaginal canals are paired from the beginning, and 

 proceeding backwards on the inner side of the intestinal trunk are 

 continued into the paired yolk-ducts at the point marked with * in 

 fig. 1, PI. YII. With a second dorsal opening behind the vaginal 

 opening, which ends blindly. The vitellaria of the two sides are whol- 

 ly separate in front; but their boundary bahind can not be dis- 

 tinguished ; extending from the level of the vaginal opening to near 

 the posterior extremity of the body. Paired yolh-ducts arising from 

 the vitellarium on each side at the level marked with * in fig. 1, PL YII, 

 and proceeding backwards as the direct continuations of the vaginal 

 canals, unite with each other in the median line of the body, on the 



