H. KOB AY ASI II : 



space and nourishment available for the parasite. The oral sucker 

 averages 0,3-0,34 mm. and the posterior sucker 0,24-0,26 mm. in trans- 

 verse diameter. The ratio of the diameter of the suckers is 15: 12-13. 



There is no pigmentation in the body. In the fresh state the 

 body is translucent with a slight reddish tint. The skin is smooth 

 and without spines. Close behind the oral sucker lies the muscular 

 pharynx, measuring 0,18 mm. in length and 0,15 mm. in breadth. 

 The oesophagus is very short, about 0,2-0,25 mm. in length. The 

 blind ends of the intestinal tubes lie near the posterior end of the 

 body. 



The terminal vessel of the excetory organ extends from the 

 posterior end of the body to the posterior wall of the seminal re- 

 ceptacle, taking a sinuous course in the median line, and is slightly 

 expanded at the anterior end. The lateral vessels arise, not from 

 the anterior end of the terminal vessel, but laterally and somewhat 

 behind its anterior end, and can be traced anteriorly as far as the 

 posterior end of the oesophagus on the outer side of the intestine. 



The lobes of the testes are variable. Broadly speaking, four of 

 them can be counted in the anterior (left) testis, while the posterior 

 (right) testis has generally five branches, with secondary branchlets, 

 all lying in a horizontal plane. The two vasa defereutia unite in 

 the middle part of the body and form a thick median vessel, the 

 seminal vesicle, which is filled with semen and which after some 

 windings reaches the common genital pore, situated just in front of the 

 ventral sucker. 



The ovary has three lobes and lies in the posterior third of the 

 body. The vitellaria are composed of numerous small follicles and 

 present a closely crowded acinous appearance. They reach ordinarily 

 from the level of the ovary to the ventral sucker, but sometimes it 

 lies more foreward or backward. The follicles are all continuous and 

 uniformly developed. The Laurer's canal and the shell gland can 

 be seen clearly. The uterus forms about 20 or more loops. The eggs 



