158 STRONG YLOIDE A 



point of origin of its accessory branches. Vulva close to anus. 

 Uterine branches parallel. 



Hab. Alimentary canal of Elephants and Rhinoceroses. 

 Genot3r[_5e : P. ofricana Lane, 1921. 



Lane, 1921, Ind. Journ. Med. Res., ix, 165; Khalil, 1922, 

 Proc. Zool. Soc, London, 212 ; Ware, 1924, Journ. Comp. Path. 

 Ther., xxxvii, 282 ; Neveu-Lemaire, 1924, Ann. Paras, hum. 

 et comp., Paris, ii, 134, 138, 142. 



Khalil (1922) separated Memphisia from Pteridopharynx on 

 account of the presence of a well-defined cuticular collar just 

 behind the mouth- collar, and of the occurrence of an accessory 

 branch on the externo- dorsal ray of the bursa. The cuticular 

 collar, however, is extremely poorly developed in the second 

 species (M. aziza) assigned to the genus by Khalil. So far as 

 the presence of an accessory branch or boss on the externo- 

 dorsal ray is concerned, the figures of Lane (1921) and Ware 

 (1924) show that such a branch may be present in species of 

 Pteridojiharynx totally without the cuticular coUar already 

 mentioned. In fact there is a boss or rudimentary branch also 

 in most species of Murshidia. In our opinion Memphisia and 

 Pteridopharynx cannot be distinguished from each other, and 

 the presence of the cuticular collar can only be considered as 

 of specific importance. 



The genus Pteridopharynx is very closely related to Mttrshidia. 

 It differs from the latter genus in the presence of teeth at the 

 base of the buccal capsule and in the form of the dorsal ray 

 of the bursa. In Murshidia the main dorsal stem is cleft right 

 to the origin of the two pairs of accessory branches, which are 

 well separated from each other for the greater part of their 

 length ; whereas in Pteridopharynx the dorsal ray is cleft for 

 only half the distance between its tip and the origin of the 

 accessory branches, which are fused for the greater part of 

 their length. The dorsal lobe of the bursa is particularly 

 elongate in Pteridopharynx, while in Murshidia the whole 

 bursa is short and stunted. The recently-described genera 

 Henryella Neveu-Lemaire, 1924, and Buissonia Neveu- 

 Lemaire, 1924, appear to resemble Murshidia in the absence 

 of teeth at the base of the buccal capsule, but approach 

 more closely to Pteridopharynx in the arrangement of the dorsal 

 ray. They thus form a connecting-link between Murshidia 

 and Pteridopharynx, and it appears probable that further 

 investigation will show that not only Neveu-Lemaire's genera, 

 but also Pteridopjharynx , cannot be generically separated from 

 Murshidia. 



5. Gyalocephalus Looss, 1900. 



External and internal leaf-crowns present. Buccal capsule 

 more or less cylindrical, with thick walls which, decreasing in 



