10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



Female 14.1 mm. long by 200;u, wide (7.17 to 7.25 mm. long by 

 100/x, to 175ju, wide, according to Vryburg). Cuticle devoid of spines 

 except at the posterior end of bod}^ and in cavity of oral sucker. 

 Oral sucker subterminal, 68/a in diameter ; acetabulum small, re- 

 tracted, and situated 268ju, caudad of the oral sucker. Esophagus 

 simple; intestinal ceca unite posteriorly 7.702 mm. caudad of esopha- 

 geal bifurcation; common cecum 6 mm. long and terminating 144/i, 

 from posterior end of body. Ovary oval and situated posterior of 

 equator of body. Vitellaria are composed of discrete follicles ly- 

 ing lateral to the common cecum and extending posteriorly from 

 the cecal union to within a short distance of the posterior extremity 

 of the body. Egg spindle-shaped, asymmetrical, with a spine 14/x 

 to 15;u, long present at one pole; uterine egg 284/* long by 44ju, wide; 

 immature ^^'g^ in which embryo is not defined, 304/x to 31G/jl long and 

 52;u to 54/A wide; mature ^gg^ containing a miracidium, 364/x to 

 400^ long by 68/i, to 72ya wide at the widest portion and 12;a to 14/;i 

 across the polar prolongations. 



Cercana furcocercous, apharyngeal, spinose. Total length 490/i,; 

 body 200/A long by 50/x wide ; tail stem 290/a long by 30/x wide ; furcal 

 rami lOO^u, long. Oral sucker 60/x long l)y 40/* wide ; acetabulum 20/* 

 in diameter. Penetration glands consist of five pairs of pyriform 

 cells, the two anterior pairs being acidophilic, coarsely granular, and 

 with large nuclei and the posterior three pairs being finely granular, 

 basophilic, and with somewhat larger nuclei. Penetration gland 

 ducts thick, opening at anterior end of oral sucker, and capped by 

 five pairs of hollow piercing spines. The germ cells, 24 in number, 

 lie caudad of acetabulum. The excretory system pattern consists of 

 four pairs of flame cells in the body and one pair in the tail stem. 



Hosts. — Primary, mammals {Bos {Bvhalus) &i*&ai?i9 Linnaeus, 1766 

 (synonym, BuffeJus tnclkus Rutimeyer. 1865 = ^50.5 indhus)) and 

 man, and, experimentally, goat, water buffalo, monke}^ {Macaca 

 sinica), guinea pig, and rats; secondary, snails (Phmorhis exushis 

 and, rarely, Lymnaea acuminaia in India ; Planorhis ffeifferi and 

 Bulinus tropicus in Africa). 



Location. — Mesenteric and portal veins. 



Distrihution. — Asia (India and Sumatra) and Africa (South 

 Africa). 



Recently Porter (1926) described a new variety of Schistosoma 

 spindalis from South Africa for which she proposed the name S. 

 spindalis variety africana. The characters upon which the new 

 variety is based are the ^g'g size, smaller than that described by 

 Montgomery for the Indian species, and also a cercaria smaller than 

 that described by Soparkar (1921). The eggs of the new variety 

 were obtained from the urine of man and measured 163/* to 258/t 



