ART. 18 THE TREMATODE FAMILY SCHISTOSOMIDAE PRICE 9 



diameter. Esoj^hagus 500/i, long; cecal branches unite posteriorly at 

 the beginning of the posterior fourth of the body and may show two 

 or three anastomoses before their final union; common cecum ter- 

 minates near posterior end of body. Testes 3 to 6 in numbor (usually 

 4, according to Khalil (1924) ), each 120fji long by 100/* wide, in a row 

 on dorsal aspect of body, caudad of acetabulum. Seminal vesicle 

 pear-shaped, 80/x in diameter, and situated immediately in front of 

 the anterior testis. Cirrus pouch and prostate absent. Genital pore 

 slightly salient and situated immediately caudad of the acetabulum. 



Female 12 to 17 mm. long, cylindrical, and attentuated at the 

 extremities. Cuticle smooth and without spines. Oral sucker small, 

 40/i in diameter; acetabulum usually retracted, SOju, in diameter. In- 

 testinal ceca unite caudally at the posterior fourth of body ; common 

 cecum relatively short and terminating about 160/* from posterior 

 extremity. Ovary elongated, 300/* long and 150/a wide, and situated 

 immediately in front of cecal union. Shell gland small and ill- 

 defined, situated in front of anterior pole of ovary. Uterus long and 

 containing numerous eggs. Vitellaria consist of elongate, densely 

 packed follicles beginning about lOO/i caudad of ovary and extending 

 about 200/X from posterior extremity. Egg spindle-shaped, symmet- 

 rical, 160/1 to 180/1 long by 50/* to 60/j, wide, and provided with a 

 blunt spine at one pole. 



Hosts. — Primary, mammals {Bos tav/rus, Ovis aries and (?) man) ; 

 secondary, snails {Physopsis africana in South Africa, the host of 

 Cercaria octadena which is regarded by Faust (1926) as the larva 

 of >iS'. hovis). 



Location. — Portal and intestinal veins. 



Distribution. — Europe (Italy, Sardinia, and Sicily), Asia (India, 

 Annam, and Malay States), and Africa (Egypt and South Africa). 



SCHISTOSOMA SPINDALIS Montgomery, 1906 

 Figures 17-22 



Synonym. — Bilharzia spindalis (Montgomery, 1906) Odhner, 1912, 

 p. 59. 



Specific diagnosis. — Schistosoina : 



Male 8.21 to 9.58 mm. long by 527/i thick (4.5 to 12.2 mm. long by 

 250/1 to 66T/t wide, according to Vryburg (1907)), Cuticle covered 

 with tubercles and spines; spines are also present in suckers and at 

 borders of gynaecophoric canal. Oral sucker 306/i in diameter; 

 acetabulum pedunculated, 357/i in diameter, and situated 900/i 

 caudad of oral sucker. (Oral sucker 300/t by 250/i; acetabulum 

 267/1 in diameter and 767/t caudad of oral sucker, according to Vry- 

 burg.) Testes 6 to 7 in number, each 85/t in diameter. Caudal 

 end of body terminates in a conical projection and at the apex is 

 located the excretory pore. 

 38876—29 2 



