228 ^- GOTO. 



line. Mouth at ti short distance from the front end of the body, 

 sHt-Uke, with its length at right angles to the long axis of the body. 

 The anterior rudimentary siiclcer very conspicuous in surface view. 

 Pharyjiz ellipsoidal, with the internal tubular cavity coinciding with 

 the smaller axis. Oesophagus almost wanting. The two intestinal 

 trunks unbranched, distinct behind, running almost parallel to the 

 lateral margins cf the body, but each making a slight inAvard winding 

 at the level of the ovary (at about the end of the anterior third of 

 the whole body), and approaching towards each other at the posterior 

 end just in front of the sucker. Common genital opening ventral 

 and median, a little behind the middle of the anterior half of the 

 body proper. Chitinous penis exceedingly long and twice bent on 

 itself; with an obliquely cut extremity ; about 0.59 mm. long. Ovary 

 situated at the hinder end of the anterior third of the whole 

 body, long, doubled on itself so as to form a loop Avith its open end 

 directed towai'ds the left side of the body, looping the right intestinal 

 trunk, and with numerous smaller convolutions. Oviduct very short, 

 with a portion of it expanded into a small receptaculum seminis. Ootyp 

 of a rhombic form in longitudinal section. Uterus very short. Vitel- 

 larium confined to tlie lateral portion of the body outside the intestinal 

 trunks ; consisting of numerous, branching tubules ; and extending 

 from the level of the pharynx to that of the posterior sucker. The 

 numerous tubules of the anterior and the posterior parts of the vitella- 

 rium of each side unite amono^ themselves into a sinofle duct, which 

 traverses the length of the intestinal trunk, and just outside this, and 

 uniting with its fellow coming from the opposite direction at the level 

 of the anterior third of the body proper, forms the pairel yolk- 

 duct. This then runs straight towards the median line of the body, 

 unites with its fellow of the opposite side, and forms the unpaired yolk- 

 duct, which is exceedingly short and immediately opens into the 



