ART. 18 THE TREMATODE FAMILY SCHISTOSOMIDAE PRICE 23 



sucker subterminal, 46/u, in diameter; acetabulum slightly salient, 

 42)u, in diameter. Esophagus simple, 204^ long; intestinal ceca unite 

 posteriorly 1.819 mm. from the esophageal bifurcation; common 

 cecum 5.109 mm. long and terminating ITS/a from posterior extremity. 

 Ovary oval in outline, 300/a long, and situated in front of cecal union. 

 Uterus 1.4 mm. long; genital pore slightly salient and situated imme- 

 diately caudad of acetabulum. The vitellaria lie on each side of the 

 common cecum and extend from the cecal union to the posterior end 

 of body. Egg oval and provided with a terminal spine; immature 

 egg 100/i, to 115/x long by 44/a to 48/x wide, spine 8fi to lO/t long; 

 mature e^^g, containing a miracidium, 125/i, to 13G/A long by 53/x to 

 QOfi wide, spine Qfi to 8^ long. 



Oercarm unknown or unrecognized. 



Hosts. — Primary, mammal (Bos (Buhalus) hubalis==Bos indi- 

 ens) ; secondary, unknown. 



Location. — Mesenteric veins. 



Disti^ibution. — Asia (India ) . 



Schistosoma homfordi Montgomery and &. turkestanicuin Skrjabin 

 are transferred to the genus Ornithohilharzia on the basis of morpho- 

 logical similarity to other species of the genus. The number and 

 position of the testes in the male, and the shape and position of the 

 ovary in the female are so similar to those in Ornithohilharzia inter- 

 media Odhner, type of OrnithohUhurzia., that they are obviously 

 congeneric. The fact that both O. homfordi and O. turkestamcmn 

 are at present known only from mammalian hosts does not appeal to 

 the writer as being a matter of sufficient importance to justify their 

 retention in the genus Schistosoma. In view of the morphological 

 relationship of 0. homfordi and O. turkestanicum to species occurring 

 in birds, it may be assumed that these parasites, which are of rare 

 occurrence in their mammalian hosts, may be only accidental and 

 facultative parasites of these hosts, and it may be surmised that they 

 are normal parasites in birds of some sort. 



The report of the occurrence of O. homfordi as a parasite of cattle 

 in France, by Marotel (1908), is apparently erroneous, as the species 

 which he described has an ^gg with two spines, one at each end, which 

 measures 80/x to 100/x long by 30/x to 35)U, wide. Since O. turkestani- 

 cimi is the only schistosome reported from cattle as having a large 

 number of testes, and an egg of the type described, it appears that 

 this was the species found by Marotel. Velu and Barotte (1924; p. 

 328) are apparently of this opinion as they give France as a locality 

 for O. turkestanioiim and their description of the egg of this si)ecies is 

 essentially the same as that given by Marotel for 0. homfordi. 



