204 S. GOTO. 



Oesophagus rather short ; the main truaks of the intestine wholly dis- 

 tinct from each other ; sending out lateral branches both outwards 

 and inwai'ds, those of the inner side, however, being a little shorter 

 than those of the outer ; the trunks terminating a little in front of the 

 foremost pair of posterior suckers. Common genital opening at the 

 hinder end of the anterior portion of the body free from the vitel- 

 larium ; penis spines short, recurved, arranged in five pairs ; each spine 

 consisting of a slender, spinous portion and a basal, lens-shaped 

 portion. Diameter of the central bulb of the penis about 0.035 mm.; 

 length of the lateral bulb 0.027 mm. Ooanj long, U-shaped, with the 

 open end directed forwards and the two arms of the U closely apposed 

 to each other ; the oviduct end occupying the median line of the 

 body and the other end situated more to the right. Oviduct after 

 proceeding from its origin a short distance forwards turns backwards 

 and a little towards the left, and is continued into the ootyp, which is 

 situated just in front of the ovary a little on the left side. From the 

 ootyp the uterus proceeds straight forwards. Genito-intestinal canal 

 arising from the oviduct just before the ootyp, and thence proceeding 

 forwards and slightly towards the right, opens into the intestine at 

 the same level as the paired yolk-ducts. The vitellaria of the two 

 sides are quite distinct behind but less so in front. The paired, 

 yolk-ducts are very short and unite with each other on the median line, 

 about half as far from the anterior end of the ovary as from that of 

 the body. The unpaired yolk-duct proceeds straight backwards, and 

 opens into the oviduct side by side with the genito-intestinal canal 

 but nearer the ootyp. Testes comparatively few in number, small ; 

 the anterior ones arranojed in a sino:le row on the left side of 

 the ovary ; the whole testes extending from a little behind the 

 front end of the ovary to about midway betAveen its hinder 

 end and the termination of the intestinal trunks. Vas deferens 



