280 s. GOTO. 



sucker-bearing portion occupies about one-third ; the latter 

 slender and narrow and joined to the body proper by a slender 

 stalk-like portion, with about 46 pairs of minute suckers ; the 

 anterior end of the sucker- bearing portion projecting on the 

 ventral side somewhat in front of the point of union with the 

 body proper. Oesophagus rather short, the main intestinal 

 branches with numerous secondary branches on the outer side, 

 which bifurcate only once or twice, and with very short diverticula 

 on the inner side ; one of the main branches extends backwards 

 further than the other. Common genital opening on the same 

 level as the hind end of the oesophagus ; genital atrium moder- 

 ately spacious, armed with numerous very small, conical, slight- 

 ly recurved spines, 4-5.6 /^ long. Ovary incompletely S-shaped 

 in the dorsal aspect, presenting an inverted V-shaped border 

 anteriorly, the hind half very slender, and the posterior some- 

 what thickened end folded once or twice on itself. Oviduct aris- 

 ing on the right side, and proceeding obliquely backwards and 

 mediad till the hind end of the slender portion of the ovary, and 

 then turning forwards to become the ootyp ; bearing a distinct 

 receptaculum seminis at the middle of its course. Vitellaria ex- 

 tending from a short distance behind the beginning of the intes- 

 tine to the hind end of the shorter of the two main branches. 

 Paired yolk-ducts arising at a point removed from the fiont end 

 of the ovary 1/5 as much as the common genital opening, unit- 

 ing on the same level as the middle of the ovary, and the 

 single yolk-duct thus formed opening into the oviduct close 

 to the ootyp. Vaginal opening dorsal and median, mid- 

 way between the front end of the body and that of the 

 ovary ; vaginal canal tolerably long and dividing into two only 



