b PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



gate, in posterior half of body, and cephalad of cecal union. Uterus 

 long, ending posteriorly in a bulblike ootype, immediately posterior 

 of which the shell gland, oviduct, and vitelline duct unite. Vitellaria 

 composed of transversely elongated follicles situated on each side 

 of the common cecum, extending from the cecal union to the pos- 

 terior end of the body. Egg oval, 120ju, to 160/x long by 40/x to 60u 

 wide, provided with a terminal spine. 



Cercaria furcocercous, apharyngeal, spinose. Body, according to 

 Faust (1926), 140/* to 240/x long by 57/i to 100/a wide; tail stem 

 116(1 to 250/A long by 35/i to hOfx wide; f ureal rami 60/x to lOOju, long. 

 Oral sucker 64/;i long by 60/i wide; acetabulum small. Penetration 

 glands consist of two pairs of large nucleated cells with granular 

 acidophilic cytoplasm and three pairs with basophilic cytoplasm. 

 Penetration gland ducts moderately thick, opening at the anterior 

 end of oral sucker and capped by five pairs of hollow piercing 

 spines. The germ cells lie caudad of acetabulum and consist of 

 several large cells. The excretory system pattern consists of three 

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



Hosts. — Primary, man, monkey {Cercocehus atys Audebert=6'€rca- 

 'pithecus fuligmosus) , and, experimentally, rats and mice; secondary, 

 snails {Bulinus contortiis, B. dyhowski and B. Imiesi in Egypt; B. 

 hrochii in Tunis; Physopsis africana in Belgian Congo, Natal, and 

 Transvaal ; P. (?) glohosa in Nyasaland and Sierra Leone ; P. nasuta 

 in Tanganyika Territory ; Lymnaea natalensis in South Africa ; and 

 Planorhis dufourii in Portugal). 



Location. — Portal and mesenteric veins, and veins of bladder. 



Distribution. — Africa, Australia, Asia (Arabia, Cyprus, India, 

 Mesopotamia, Palestine, and Persia), and Europe (Greece and Por- 

 tugal ) . 



SCHISTOSOMA MANSONI Sambon, 1907 



L'igures G-11 



Synonyms. — Distoma hae7)iatobiu7/v'B'\l\mrz, 1852, in part; Sckisto- 

 sonvmrh aniericamAiin Piraja da Silva, 1909. p. 294; Bilharzia mansoni 

 (Sambon, 1907) Ascanio-Kodriguez, 1916, p. 92; Distomum mansoni 

 (Sambon, 1907) Iturbe, 1917, p. 52. 



/Specific diagnosis. — Schist osottim : 



Male about 10 mm. long by 1.2 mm. wide. Body form similar to 

 that of S. haeinatohiy/in. Cuticle tuberculate and spiny. Oral sucker 

 subterminal; acetabulum pedunculated and situated about 530/* 

 caudad of oral sucker. Esophagus surrounded by esophageal glands; 

 intestinal ceca short, uniting in front of equator of body; common 

 cecum very long, terminating near the posterior extremity of the 

 body. Testes small, 8 to 9 in number, situated at anterior end of 



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