PARASITES OF ELEPHANTS. 



207 



in appearance. Posterior to the hea.d a cnticular expansion is 

 present on either side of the body. The female is practically 

 straight ; its tail is very long and is gnidiially attenuated to a 

 fine point. The caudal end of the male is bent towards the 

 ventral surface, and its end is more rounded than in the female. 

 Skin. — The cuticle is finely striated at intervals of '007 mm, 

 throughout the whole length of the body. The cuticular 

 expansions near the cephalic end of the body are placed on both 

 lateral sides, and extend from the level of the pharynx to prac- 

 tically the middle of the (esophagus. They are -3 ram. in length 

 and '037 mm. maximum breadth, and are striated. 



Text-fig are 1. 



Leiperenia leiperi Khalil. Cephalic end. 



Mouth collar. — -The mouth collar is very short and has a 

 rounded shape. It is "012 mm. long and -06 mm. in diameter. 

 The mouth-opening is practically circular and is surrounded by 

 ten small lips. The lip in the mid-ventral line and that in the 

 mid-dorsal line are the lai'gest and broadest. The lips placed on 

 either side of these lines are smaller and rounded. There is no 

 mouth capsule. 



Pharynx. — This is a short muscular canal. Its musculature is 

 more closely set and of a finer texture than that in the succeeding 

 oesophagus. It is also distinctly demarcated from it by a deep 

 groove. For these reasons I named that specialized part of the 

 oesophagus the pharynx. The shape of the pharynx is cylindrical, 

 with a small bulging in the middle. It is 'OSS mm. long and 

 •06 mm. maximum diameter. From its cephalic end project 

 conical processes ; their apices ai-e directed antero-laterally. The 

 number of these processes and their structure can only be 

 ascertained under the oil immersion lens. They are eight in 

 number surrounding the mouth-opening, and they are muscular 



15* 



