26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



Seminal vesicle long and free in the parenchyma. Testes, about 110 in 

 number, in posterior part of body on each side of the common cecum. 

 Female genital opening immediately posterior to acetabulum. Uterus 

 short and containing a single egg. Vitellaria situated on each side of 

 the common cecum. Egg elongated anteriorly, enlarged and provided 

 with a small spine posteriorly. 



Type species. — Bilharziella polonica (Kowalewski, 1895) Looss, 

 1899. 



KEY TO SPECIES OF BILHAEZIBLLA 



Male 4 mm. long by SSO/ot wide; testes 110 in number; female 2 mm. long; egg 

 38.5/i to 400m long- by 100// wide, elongated anteriorly and widened posteriorly. 



B. polonica, p. 26. 

 Male 2.3 mm. long by 96/u wide ; testes 50 to 70 in number ; female 3.4 to 4 mm. 

 long by 65// wide ; egg spindle-shaped, 226// long by 62// wide. 



B. yokogawai, p. 27. 



BILHARZIELLA POLONICA (Kowalewski, 1895) Looss, 1899 



Figures 56-58 



Synon/yms. — BllhaTzia polonica Kowalewski, 1895, pp. (1-27) 41- 

 70 (in Atuis hoschas fera and A. crecca; Poland) ; Schistosotnuon 

 polonicwnv (Kowalewski, 1895) Railliet, 1898, p. 412; Ornithohil- 

 Jiarzia polonica (Kowalewski, 1895) Tanabe, 1925, p. 258. 



Specific diagnosis. — Bilharziella : 



Male 4 mm. long by 530/a Avide. Body flattened, lanceolate. Oral 

 sucker 102/x in diameter; acetabulum 136ju, in diameter and situated 

 about 760/x cauclad of oral sucker. Esophagus simple, bifurcating 

 in front of acetabulum ; intestinal ceca unite posteriorly a short dis- 

 tance anterior to equator of body; common cecum long, extending 

 caudally in a zigzag manner and terminating near posterior end of 

 body. Testes numerous, about 110 in number, situated on both sides 

 of the common cecum. Cirrus pouch present, containing the ejacu- 

 latory duct and a well-developed prostate. Seminal vesicle long and 

 only partially enclosed by the cirrus pouch. Genital pore on left 

 side of body, 800/x caudad of acetabulum. 



Female about 2 mm. long and 250/a wide. Body form similar to 

 that of male. Oral sucker 51/a in diameter; acetabulimi 68/x in diam- 

 eter and situated 370/x caudad of oral sucker. Digestive tract similar 

 to that of male. Ovary weakly spiral and situated in front of cecal 

 union. Uterus short and containing a single egg. Genital pore 

 situated immediately caudad of acetabulum. Vitellaria composed 

 of numerous follicles lying on each side of the common cecum. 

 Egg 385)u, to 400/x long by 100/a wide, elongated anteriorly and widened 

 posteriorly, and provided with a small hooklike spine. 



Cercana unknown or unrecognized. 



