218 S. GOTO. 



portion which ends with a mucronate apex, a middle portion oc- 

 cupying about half the whole length of the body, and a posterior, 

 broad, portion mostly free from the vitellarium and carrying the 

 suckers near its posterior margin. The innermost small pair of 

 suckers situated in a line with the posterior halves of the others. 

 Chitinous pieces of the suckers as represented in fig. 3, PI, XIII. 

 Inner pair of hooks solid, very much smaller than the outer, with 

 strongly recurved, pointed end and bent almost at a right angle at 

 the middle of their lensrth, 0.03 mm. lono: if its middle bendin;? be 

 straightened out. Outer pair solid, strongly recurved at the end, with 

 a large process a little distally from the middle of its length, 0.09 mm. 

 long (curvature not taken into account) ; their forms as represented 

 in fig. 2, PI. XIII. Oesopliagiis single only for a short distance 

 posterior to the small pharynx, and sending out numerous lateral, 

 anastomosinjT branches durinf): the remainder of its lenMh. Two 

 pairs of main intestinal tninlcs may be distinguished, the inner 

 of which corresponds to those of other species and reaches the 

 hinder end of the body ; the outer on the other hand extends 

 only for about t^^'0-thirds of the whole length of the body fi-om 

 a short distance behind the front end of the body close to the 

 lateral margins. All the four trunks are connected with each other 

 by numerous, closely anastomosing branches. Common genital opening 

 near the hinder end of the anterior, slender portion of the body, just 

 behind the beginning of the inner pair of intestinal trunks. Ovary 

 median, at about the middle of the whole length of the body ; its 

 windings very complicated, as represented in fig. 1, PI. XIV. Oviduct 

 arising from the posterior right end of the ovary, thence proceeding 

 backwards and towards the left side, and almost reaching the median 

 line of the body suddenly turns dorsad and towards the right, and 

 continuing its course for a short distance, again turns dorsad, anteriad, 



