224 s. GOTO. 



firound the mouth-cavity; with three pairs of circular or 

 elliptical suckers at the posterior end, each with a semi- 

 circular chitinous supporting piece with one of the ends 

 provided with a claw. With a suhcylindrical caudal 

 appendage, which bears at its extremity a pair of small 

 suckers destitute of any chitinous framework; often with 

 a pair of hooks between these suckers. With a paired 

 vaginal opening on the ventral side of the body. P(jrus 

 o'enitalis ventral and median. 



1. Onchocotijle iipinacis^ n. sp. 

 (Pis. XY & XYI.) 

 BoJif long-lanceolate, elliptical in cross-section, uhmt <S or 

 1) nun. long, with the anterior end roundly truncate. Mouth 

 su1jtermin:d, ventral, with a large sucker around it like that of 

 the distomes. The three pairs of large, slightly elliptical posterior 

 suclicrs are arranged in a typical horse-shoe shape, with their mouths 

 turned dorsad (but lying on the morphologically ventral side), each 

 with a long semicircular chitinous piece with a narrow axial cavity 

 throughout its length and with one of its ends pointed and curved in 

 the form of a claw. These chitinous pieces lie in the suckers with 

 their lengths parallel to the longer axes of the suckers. Caudal 

 appendage suljcylindrical, with a bifid extremity which carries a pair 

 of small ellipsoidal suckers with tlieir mouths opening at the top of 

 either bifid end ; with a pair of lioohs 0.04 mm. Icmg (curvature not 

 reckoned) and of the form re[)resented in fig. 5, PI. XV, between the 

 suckers ; directed obrupiely f )rwards towards the left side of the body. 

 Oesopluigus of moderate length. Intestiiud trutdîs simple, uniting with 

 each other at the level of the first pair of posterior suckers, and at this 

 point giving out two simple branches, one of which is continued 



