ART. 18 THE TEEMATODE FAMILY SCHISTOSOMIDAE PRICE 11 



long by 4G.4/X to 70/a wide. The cercaria, obtained by infecting 

 Planorhis pfeifferl and Bulinus tropicus, measured as follows : Body 

 153.3/x to 183/A long by 50.8/* to 86.6/x wide; tail stem 173.3/t to 

 200/i long by 50.8/a to 86.6/a wide ; f ureal rami 66.6/* to 83.3/* long by 

 21/* to 26.6/* wide ; oral sucker 40/* to 53.3/* long by 30/* to 33/* wide ; 

 acetabulum 18.5/* by 26.6/*. 



The reported occurrence of S. spindalis in man includes at least 

 three apparently authentic cases, one reported by Cawston (1925) 

 and two by Porter, and there are one or two doubtful cases. Daub- 

 ney (1923) considers the egg reported from the urine of a Madras 

 native by Christophers and Stephens (1905) as probably belonging 

 to this species. It is possible that the eggs described from human 

 urine by Chesterman (1923) may also be those of S. spindalh. 



SCmSTOSOMA INDICUM Montgomery, 1S06 



Figures 26-29 



Synonym. — Bilharzia ind'ica (Montgomery, 1906) Hutyra and 

 Marek, 1910, p. 902. 



Specific diagn osis. — Sc/iistof<o?na: 



Male 8.35 to 17 mm. long; anterior part of body straight, 1 to 1.5 

 mm. long and 400/* wide; posterior part of body cylindrical due to 

 inrolling of the edges to form the gynaecophoric canal; maximum 

 dorsal width 350/* and greatest dorsoventral width 400/* to 500/*. 

 Cuticle tuberculate and spiny. Oral sucker subterminal, infundibuli- 

 form, 270/* to 320/* in diameter; acetabulum pedunculated, 350/* to 

 425/* in diameter, and situated 0.9 to 1.5 mm. caudad of oral sucker. 

 Esophagus 425/* long; cecal branches unite caudally about 0.85 to 

 1.5 mm. from posterior end of body, forming a common cecum which 

 terminates about 100/* from the posterior extremity. Testes 5 to 9 

 in number, situated about 400/* caudad of acetabulum ; seminal vesicle 

 small, 85/* in diameter and lying in front of the first testis; the genital 

 pore opens in the median line at the anterior end of the gynaecophoric 

 cijnal. The excretory bladder is 80/* long; excretory pore terminal. 



Female 9 to 22 mm. long and 190/x wide. Cuticle smooth except 

 for a few spines on the posterior end of body and on the inside of 

 suckers. Oral sucker small, subterminal; acetabulum 50/* to 60/* in 

 diameter, usually retracted. Esophagus 230/* long; cecal branches 

 unite caudad of ovary, forming a slender common cecum which tei-- 

 minates about 200/* from the posterior extremity. Ovary situated at 

 equator of body, oval in shape, 500/* to 750/* long by 100/* wide ; uterus 

 5 to 7 mm. long; genital pore immediately caudad of acetabulum. 

 Vitellaria lie on each side of the conmion cecum and extend from the 

 cecal union to 200/* to 300/* from the posterior end of body. Egg 

 oval and provided with a spine at one pole; uterine egg from 92/* 



