30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 75 



threadlike portion by a slight dilation. Oral sucker smaller than 

 acetabulum. Gynaecophoric canal absent. Cirrus pouch and semi- 

 nal vesicle present. Testes numerous and situated in posterior por- 

 tion of body. Female unknown. 



Type species. — Trichohilharzia kossarewi Skrjabin and Zakharow, 

 1920. 



TRICHOBILHARZIA KOSSAREWI Skrjabin and Zakharow, 1920 



Figure 55 



Specific diagnosis. — TrichohUh arzia. 



Male 4 mm. long; anterior portion of body 60/a wide, posterior 

 portion 20/^ wide ; between the anterior and posterior portions the 

 body is dilated to 150/x in width and this part is covered with fine 

 spines. Oral sucker 30/^ in diameter; acetabulum 50ju, in diameter, 

 spiny, and situated 690/i caudad of oral sucker. Testes numerous, 

 50/x long by 18/^ wide, and situated in the posterior, threadlike por- 

 tion of body. Cirrus pouch 200/x long. Seminal vesicle 220;tt long. 

 Genital pore 1.26 mm. from anterior end of body. 



Femdie unknown. 



Cercaria unknown or unrecognized. 



Hosts. — Primary, birds {Querquedula querquedula { = Anas cir- 

 cia) ) ; secondary, unknown. 



Location. — Blood vessels. 



Distribution. — Europe ( Russia ) . 



Genus GIGANTOBILHARZIA Odhner, 1910 



Generic diagnosis. — Bilharziellinae : Female cylindrical and shorter 

 than the somewhat flattened male. Posterior extremity of both sexes 

 provided with lateral lobelike projections. Cuticle without spines or 

 tubercles. Suckers absent. Gynaecophoric canal reduced to a short 

 groove, situated in anterior part of body. Digestive system similar 

 to that of BiJharzieTla. Testes originate caudad of gynaecophoric 

 canal and extend to posterior end of body. Cirrus pouch absent. 

 Genital pore situated at anterior end of gynaecophoric canal and 

 slightly to the left of the median line. Ovary moderately long and 

 spiral. Vitelline follicles occupy about nine-tenths of body length. 

 Uterus short and containing a single egg. 



Type species. — GigantohilhaTzia acotylea Odhner, 1910. 



GIGANTOBILHARZIA ACOTYLEA Odhner, 1910 



Figures 59-60 



Specific diagnosis. — Gigantohilharzla. 



Male 140 to 165 mm. long by 250/a to 350|U, wide in expanded speci- 

 mens; when preserved, the length is about one-half that of expanded 



