PARASITES OF ELEPHANTS, 255 



Their cephalic ends are thick and surrounded by an everted lip. 

 In their course they apparently entwine each other. Their tips 

 are sharp and curved backwards. The accessory piece is -13 mm, 

 long and curved dorso-ventrallj'. 



Termination of the female. — At the level of the vulva the 

 ventral surface curves towards the dorsum, forming a conical- 

 shaped tail. The opening of the vulva is directed caudally. The 

 anus opens -12 mm. posterior to the vulva, and is also directed 

 caudally. The tail is -52 mm. in length ; its end is rounded. 

 There are two caudal papillae marked on the surface by a depres- 

 sion 'SS mm. from the extremity of the tail. 



Ova. — The ova in the terminal portion of the uterus measure 

 48 /.t by 30 fj. They are then in the morula stage. 



Hahilat. Intestine of African elephant (Uganda). 



Dlsciissioti. 



This species differs from P. africana in the shape of the mouth 

 capsule, which is more elongated ; the absence of the plumose 

 appearance of the oesophagus ; the greater distance between the 

 vulva and anus ; and the general appearance of the tail in the 

 female. In the male the spicules are shorter, and the bifid end 

 of the branch of the dorsal ray is also much longer. The total 

 length of the body and of the various structures are also different. 



As the plumose corrugation of the oesophagus for which Lane 

 suggested the generic name Pteridoph.arynx is absent, this can 

 only be considered a specific chni'ucter. J'ho same plumose 

 appearance is present in Memphisia aziza, which undoubtedly 

 belongs to a different genus on' account of the configuration of 

 the head and the presence of an additional ray in the bursa, both 

 of which are important morphological characteristics. 



Genus Memphisia Klialil, 1922. 



Body is slender. The rays of the external leaf-crown do not 

 project freely above the head. The oral cavity is deep, and 

 is wider from side to side than from before backwards. There 

 are chitinous teeth in the floor of the mouth capsule. A shallow 

 oesophageal funnel is pi-esent. The oesophagus is short and thick. 

 Plumose appearance of the cephalic end of the lumen of the 

 oesophagus may or may not be present. 



Just caudad to the mouth collar the cuticle is raised to form 

 a collar surrounding the circumference of the body. The degree 

 of projection of this cuticular collar varies in the two species. 



Male. The lateral ray has an accessory ray on its posterior 

 border. The externo-dorsal ray has a branch directed caudally. 

 Of the three branches of the dorsal ray the outer two are fused 

 to nearly their tips. Their dual nature is indicated by ending in 

 two papillfe. The two spicules are equal and similar. An 

 accessory piece is present. 



18* 



