AET. 13 TEEMATODE PARASITES OF MARINE MAMMALS^ PRICE 31 



lobed, and more or less obliquely placed, and almost filling posterior 

 part of body. Ovary, Mehlis's gland, seminal receptacle, and 

 Laurer's canal as in Opisthorchis. Vitellaria compact and extend- 

 ing anteriorly beyond acetabulum. Uterine coils often extend extra- 

 cecally and preacetabular. Parasitic in gall bladder and bile ducts 

 of mammals and birds. 



Type species. — Metorchis aJhidus (Braun, 1893) Looss, 1889. 



METORCHIS ALBIDUS (Braun, 1893) Looss, 1899 



Plate S, Figube 34 



Synonyms. — Distomwn albidum Braun, 1893, pp. 347-355; D. {Di- 

 crocoeliunv) alhidum Braun, 1893, p. 353; Opistliorcliis albidus 

 (Braun, 1893) Railliet, 1896, p. IGO. 



Description. — Metorchis : Body spatulate, 1.6 mm to 2.2 mm long 

 by 800ju, to 1 mm wide ; anterior part of body narrower than the flat 

 posterior part. Cuticle covered with small spines. Oral sucker sub- 

 terminal, 200/A to 240)a in diameter ; acetabulum 200/^ in diameter and 

 situated 600/i, to 900/i, from the anterior end of the body. Pharynx 

 ovoid, 75/x to 90/x long by 47/a to 85^ wide ; esophagus 28fx long ; in- 

 testinal ceca extend to posterior end of body. Genital aperture pre- 

 acetabular; seminal vesicle relatively short. Testes lobed, oblique 

 in position, the left testis anterior to right, and situated in the pos- 

 terior jDart of the body; the anterior testis is 300/a to 34:0ju, long by 

 300/x to 380/A wide, and the posterior 320/a long by 380/* wide. Ovary 

 somewhat triangular in shape, lOOju, to ISOjx long by 140ja to 180/x 

 wide, situated a short distance in front of anterior testis. Seminal 

 vesicle large and situated posterolateral of ovary; Mehlis's gland 

 diffuse. Vitellaria lateral and extending from near level of intestinal 

 bifurcation to level of ovary. Uterus greatly convoluted and occupy- 

 ing the greater part of the inter vitellarian field from the ovary to 

 a short distance cephalad of acetabulum. Eggs 27/i to 32/x, long by 

 13/x to 16/1 wide. 



Hosts. — Ualichoerus g7'ypus, Felis domestica^ Vulpes vulpes, and 

 Canis fatniliaris. 



Location. — Gall bladder and bile ducts. 



Distribution. — Europe. 



Genus PSEUDAMPHISTOMUM Luhe, 1908 



Generic diagnosis. — Metorchiinae : Body conical in shape, anterior 

 end pointed ; posterior end truncate and surrounded by a ridge giv- 

 ing it a suckerlike appearance. Cuticle beset with fine spines. Ex- 

 cretory pore in center of posterior suckerlike structure. Intestinal 

 ceca slightly sinuous, extending to posterior end of body. Genital 



