THE ANIMAL PARASITES OF MAN 



cylindrical. The genital pore is situated in the median line anterior 

 of the ventral sucker. The ovary is on one side of the body in 

 front of the testes. It has many ramifications, as have also the testes, 

 which lie obliquely one behind the other. The uterus, in the shape of a 

 rosette, lies in front of the sexual glands ; the vitelline sacs at the sides 

 and in the posterior end are amply developed in both directions. Laurer's 

 canal is .present, but there is no receptaculum seminis ; the vesicula semi- 

 nalis is situated in the cirrus pouch ; the ova are large, not very numerous, 

 and only develop after they have been deposited. This parasite infests the 

 biliary ducts of herbivorous animals. 



I. Fasciola kepatica, L., 1758. 



Syn. : Distomum hepaticum, Retz., 1786; Fasciola humana, Gmel., 1789; 

 Distomum cavies, Sons., 1890 ; Cladoccelium hepaticum, Stoss., 1892. 



Length 20 30 mm., breadth 8 13 mm., 

 head-cone 4 5 mm. in length and sharply 

 differentiated from the posterior p^art of the 

 body. Spines in altern citing transverse rows 

 and extending on the ventral surface to the 

 posterior border of the testes, and on the 

 dorsal surface not quite so far. The spines 

 are smaller on the head cone than on the 

 posterior part of the body, where they are 

 discernible with the naked eye. The suckers 

 are hemispherical, and near each other ; the 

 oral sucker is about i mm. and the ventral 

 sucker about r6 mm. in diameter. The 

 pharynx, which includes almost the entire 

 oesophagus, measures 07 mm. in length, and 

 o - 4 mm. in breadth. The intestine bifurcates 

 in the head-cone and the branches are even 

 here furnished with blind sacs directed out- 

 wardly. The ovary is ramified and situ- 

 ated in front of the transverse vitello duct ; 



FIG. 83. Intestine of * ne shell-glands lie near the ovary in the 

 median line ; posterior to the transverse vi- 

 tello duct are the greatly ramified testes, 

 which occupy the greatest portion of the 



posterior part of the body, with the exception of the lateral and 

 posterior border ; the vasa efferentia only unite at the entry into 

 the cirrus pouch. The vitellaria occupy the sides of the pos- 

 terior part of the body commencing at the level of the ventral 

 sucker and uniting behind the testes. The ova are yellowish-brown, 



Fasciola hepatica, L. 5/1. 

 From a specimen that is 

 not yet pubescent. 



