246 



THE ANIMAL PARASITES OF MAN 



two characteristic curves, one at the anterior border of the anterior 

 testis, the other between the two testes. The genital pore is at the 

 anterior border of the ventral sucker; the cylindrical cirrus pouch 

 extends from behind the ventral sucker to half-way to the shell gland. 

 The seminal vesicle extends forwards within the cirrus pouch as a 

 convoluted tube. From its anterior portion is given off the caecal 

 appendage, which has itself short lateral diver- 

 ticula. It runs backwards, ending blindly 

 about 0*5 mm. from the posterior end of the 

 cirrus sac. The seminal vesicle is continued as 

 the pars prostatica (?) 0-5 mm. long, and this 

 by the very short ejaculatory duct (13 /-t), and 

 finally by the fairly long cirrus, which is beset 

 with very fine spines except at either extremity. 

 The ovary and shell gland are situated at about 

 the middle of the body with the testes behind 

 them, and the uterus in front. The vitellaria 

 extend from the ventral sucker to the posterior 

 border. The eggs measure 120 //, to 130 /i in 

 length and 77 /z, to 80 //, in breadth, and resemble 

 those of Echinochasma sp. in dogs. The larval 

 stages are said to occur in shrimps. 

 Habitat. Intestine of pig and man. 

 Distribution. In man : India, Siam, China, 

 Assam, Sumatra. It is common in Cochin 

 China (16 out of 133 Annamites, Noc.), in 

 Tonkin very rare. Dr. J. Bell has sent me 



[J. W. W. S.] human specimens from Hong Kong. In pigs : very 

 common in South China (Heanly). Common in pigs in Hong Kong. 

 Sixteen out of 248 pigs (i.e., 6 per cent.) infected in Hanoi. 



' FIG. 147. Fasciolopsis 

 rathouisi, Poir. : the 

 mouth at the top, and under 

 it the genital pore and ven- 

 tral sucker, behind which 

 again is the uterus. The 

 vitellaria are at the sides, 

 and posteriorly in the central 

 field the ramified testes ; the 

 ovary is in front of the right 

 testis. (After Claus.) 



Fasciolopsis rathouisi, Ward, 1903. 



Syn. : Distomum rathouisi, Poirier, 1887. 



Fifteen to 19 mm. long by 8*5 to 10*5 mm. broad by about 3 mm. 

 thick. Skin with spines (Leiper). Bluntly oval or elliptical with 

 short cephalic cone which is absent in Fasciolopsis bnski. Oral sucker 

 subterminal, 0-25 to 0-29 mm. broad by 0*2 mm. in antero-posterior 

 diameter. Distant from ventral sucker by about twice its diameter. 

 Ventral sucker 1-32 to 1*38 mm. broad by o'68 to 0*7 mm. in antero- 

 posterior diameter. (Esophagus extremely short. Cirrus sac not 

 conspicuous and straight as in Fasciolopsis buski, but is convoluted. 

 Testes one behind the other (according to Poirier they lie beside one 



