TAPE-WOEMS OF THE SOB-EAMILY AVITELLlNlNiE. 321 



genus Stilesiaj this species and Stilesia vittata, Railliet, 

 were described as having irregularly alternating genital 

 pores. Stilesia hepatica, Wolffhtigel, and Stilesia 

 sjostedti, Fuhrniann, have been described as double-pored ; 

 they do not, however, differ from the type species in this 

 respect, all four being without doubt single-pored. 



The generic diagnosis, as revised by Stiles (1893), reads : 



'^ Stilesia, Railliet, 1893. Type species, S. gJobipunc- 

 tata (Riv.), Railliet, 1893. Head with four suckers, but no 

 hooks. Strobila thin and narrow. Genital pores irregularly 

 alternate. Segments broader than long. Two distinct sets 

 of testicles present in each segment, one on each side, but no 

 testicles in the median line. Eggs very small and with but 

 one shell. 



" The following points, which may prove to be of generic 

 value, have been established only for S. globipnnctata : 

 Genital canals pass dorsally of nerve and ventral canal, but 

 ventrally of dorsal canal. Egg-shell with two conical pro- 

 jections at opposite poles. 



"Habitat: Intestine of sheep. Development unknown.^' 



The generic description can now be amplified to some 

 extent and also altered in some respects. 



Stilesia, Railliet, 1893. Type species, Stylesia globi- 

 pnnctata (Rivolta), Railliet, 1893. Head with four suckers, 

 but without hooks. Strobila thin and narrow. Genital pores 

 irreguhirly alternate. Segments broader than long. Two 

 distinct sets of testicles present in each segment, one on each 

 side, but no testicles in the median line. Ovarium on the 

 pore side. No vitelline gland, no shell-gland. Uterus 

 double, finally void of eggs, which are contained in egg- 

 pouches (paruterine organ). The genital canals pass dorsally 

 of the nerve and of the ventral canal, and ventrally of the 

 dorsal canal. Eggs with two envelopes. Habitat : Intestine 

 of sheep, goat, and dromedary, and bile-ducts of sheep, goat, 

 and South African wild antelopes (Africa, India, Italy, 

 France). 



In the genus as thus restricted, only St. globipnnctata 



