HIMASTHLIN^ 



269 



third of the circum-oral disc; pharynx 0-25 mm. in diameter; oeso- 

 phagus 0-04 mm. long; gut caeca simple, extending to end of body; 

 ventral sucker 0-9 mm. long by 075 mm. broad by 07 mm. deep ; wall 

 about 0-25 mm. thick. The 

 sucker is inclined at an angle 

 of 40 to the ventral surface. 

 Testes lobed, one behind the 

 other, behind the ventral sucker. 

 Cirrus pouch well developed, 

 reaching to the posterior edge 

 of the sucker. Genital pore in 

 the angle between neck and 

 anterior lip of ventral sucker. 



rTroi~ir v^U FlG - I 7- Echinostoma malayanum, Leiper, 



Ovaiy smooth, 03 mm. in I9 , 2 : anterior end showing collar of spinesl 

 diameter, 0*85 mm. behind ventral view. (After Leiper.) 



ventral sucker. Vitellaria very 



numerous, extending from posterior margin of sucker to posterior end 

 of body, where they intermingle. Eggs few in numb :r, brown and large. 

 Habitat. Gut of man (Tamils), Malay States. 



Sub-family. Himasthlinae, Odhner, 1910. 

 Genus. Artyfechinostomum, Clayton-Lane, 1915. 



Crown of thirty-nine spines, continuous over dorsum. Two corner 

 spines long. Vitellaria extend from posterior margin of sucker to pos- 

 terior end of fluke. Eggs without filament. [Although the possession 

 of strong rose-thorn hooks is given by Odhner as a sub-family charac- 

 teristic, yet in this genus assigned to this sub-family they have not 

 been seen. J. W. W. S.] 



Artyfechinostomum sufrartyfex, Clayton-Lane, 1915. 



Spirit specimens : 9 by 2*5 by o'8 mm. thick. Ventral sucker 

 conspicuous, i mm. in diameter. Cirrus sac 2 mm. long. Testes 

 lobed, about 1*5 mm. in diameter. Posterior border of posterior 

 testes i mm. from posterior end. Vitellaria meet posteriorly behind 

 the posterior testis. 



Family. Schistosomidae, Looss, 1899. 

 Genus. Schistosoma, Weinl, 1858. 



Syn. : Gyn<zcophoru$, Dies., 1858; Bilharzia, Cobb., 1859; Thecosoma, 



Moq. Tandon, 1860. 



The males have bodies that widen out considerably behind the ventral sucker, 

 the lateral parts of which in-roll ventrally, forming the almost completely closed 

 canalis gynaecophorus, within which the female is enclosed. There is no cirrus 

 pouch. The male has five or six testes, the females are filiform ; the uterus is long. 



