ART. 18 THE TREMATODE FAMILY SCHISTOSOMIDAE PEICE 19 



ated in the anterior fourth of body. Vitellaria extend from a short 

 distance caudad of ovary to posterior end of body. Egg 70/a long by 

 50/x wide. 



Cercaria unknown or unrecognized. 



Hosts. — Primary, birds {Lams fuscu3 and II ydrocoloeus melano- 

 cephMlus) ; secondary, unknown. 



Location. — Intestinal veins. 



Distribution. — Europe ( Sweden ) . 



ORNITHOBILHARZIA CANALICULATA (Rudolphi, 1819) Odhner, 1912 



Figure 40 



Synonyms. — Distamfi canaliculatum% Rudolphi, 1819, p. 676 (in 

 Sterncb sj^ecies; Brazil); Bilharziella canaUculata (Rudolphi, 1819) 

 Braun, 190,2, p. 142. 



Specific diagnosis. — Orrvithohilharzia: 



Male 16 mm. long and from 1 to 1.4 mm. wide. Oral sucker sub- 

 terminal, 312)u, long by 104/^ to 106/a wide ; acetabulum pedunculated, 

 450/x, in diameter and 100/* to 150/i, in height, and situated about 1 mm. 

 caudad of oral sucker. Testes numerous, originating caudad of copu- 

 latory apparatus and extending posteriorly to equator of body. The 

 genital pore is situated in anterior part of gynaecophoric canal. The 

 cirrus pouch ( ?) lies at a right angle to the long axis of the body. 



Female shorter than male, cylindrical, and thinner anteriorly than 

 posteriorly, the anterior part of body being about 60/i, wide and the 

 posterior part about 145/* wide. 



Cercaiia unknown or unrecognized. 



Hosts. — Primary, birds {Thalasseus maximus= Sterna yalericu- 

 lata) ; secondary, unknown. 



Location. — Intestine (probably from intestinal veins). 



Distribution. — South America (Brazil). 



ORNITHOBILHARZIA KOWALEWSKII (Parona and Ariola, 1896), Odhner, 1912 



Figures 41-42 



Synonyms. — BUharzla. koumleioskii Parona and Ariola, 1890, pp. 

 114-116 (in Larus melanocephalus ; Italy) ; Schistosoma kowalewskii 

 (Parona and Ariola, 1896) Railliet, 1899, p. 788; BilJum^ziella kow- 

 alewskii (Parona and Ariola, 1896) Looss, 1899, p. 658. 



Specific diagnosis. — OrnithohiJharzia : 



Male 14 mm. long by 1 mm. wide. Oral sucker cuplike, subter- 

 minal, smaller than acetabulum, and measuring 364/x in diameter; 

 acetabulum pedunculated, circular, 560/* in diameter. Cuticle with- 

 out tubercles or spines. Esophagus bifurcates about 750/* caudad of 

 oral sucker, common cecum short. The gynaecophoric canal origi- 



