262 



THE ANIMAL PARASITES OF MAX 



Ut. 



- V.5C. 



in front of the middle of the body. The pharynx is small (0*09 mm.), 

 the oesophagus minute, the intestinal caeca reach to the posterior 



extremity. Between them, and in front of 

 their blind ends, lie the two elliptical testes, 

 one generally a little in front of the other. 

 In front of them, either in the median 

 line or somewhat laterally, the spheroidal 

 ovary is situated ; in front, again, is the 

 uterus, the coils of which usually extend 

 beyond the median field. The vitellaria 

 are at the sides of the central third of the 

 body, thus commencing in front of the 

 ventral sucker ; cirrus pouch absent ; the 

 genital pore is close in front of the 

 acetabulum. The excretory pore is ter- 

 minal (?). Eggs 29 /JL by ii IJL. 



Metorchis truncatus lives in the bile- 

 ducts of the seal, cat, dog, fox, and 

 glutton (Gulo borealis). The source of 

 infection is unknown, although one would 

 suspect fish. Askanazy did not succeed 

 in getting this fluke in his feeding experi- 

 ments, but another species, Metorchis 

 albidus, not uncommon in cats by feeding 

 them on roach (Leuciscus rutilns). 



FIG. 162. Metorchis truneatus, 

 Rud. : from the biliary ducts of the 

 domestic cat. V.s., ventral sucker ; 

 /., gut ; V.sc., vitellaria ; T., testes ; 

 O. t ovary ; R.s., receptaculum sem- 

 inis; Ut., uterus. 25/1. 



Family. Heterophyiidae, Odhner, 1914. 



Genus. Heterophyes, Cobbold, 1866. 



Syn. : Cotylogonimus, Liihe, 1899; Ccenogonimus, Looss, 1899. 



No crown of spines on head. Body divided into a narrow, movable, anterior 

 part (neck), and a broader, less movable, posterior portion, which contains the 

 genitalia. The suckers separated from one another by a space equal to half the 

 length of the body or more ; the pharynx is close behind the oral sucker ; the 

 oesophagus is long ; the intestinal caeca extend to the posterior border ; the genital 

 pore is placed laterally, and behind the ventral sucker. Genital sucker provided 

 with a circlet of chitinous rodlets, shaped like stags' horns. The testes are at the 

 posterior end, the ovary in a median position in front of them. Laurer's canal with 

 receptaculum seminis present; the small vitellaria are at the sides of the posterior 

 part of the body. Parasitic in the intestine of mammals and birds. 



Heterophyes heterophyes, v. Sieb., 1852. 



Syn. : Distomum heterophyes, v. Siebold, 1852; Heterophyes cegyptica, Cobbold, 

 1866; Mesogonimus heterophyes, Railliet, 1890; Caenogonimus heterophyes, Looss 

 1900; Cotylogonimus heterophyes, Braun, 1901. 



