PARASITES OP ELEPIIANXS. 



251 



Shape ofhody. — lu the preserved condition the body of both 

 males and females is practically straight. The male is 14-15 mm. 

 long. The female is slightly longer, being on an average 

 16-5-17 mm. The greatest diameter of the body is about the 

 middle, being -46 mm. in the male and -65 mm. in the female. 

 The body tapers slightly towards the head end and the caudal 

 end. In the female the tail becomes suddenly constricted from the 

 body, appearing to the naked eye as a spinous process projecting 

 from the posterior end of the body. 



Skin. — The skin is finely striated throughout the whole length 

 of the body, including the tail of the female. The strlations are 

 regularly placed at distances of 10 /x between. There is no 

 cuticular expansion. 



Mouth collar. — The mouth collar hns a rounded outline. It is 

 separated from the rest of the body by a distinct groove. The 

 diameter of this collar is shorter than that of the body in its 

 immediate neighbourhood. It is -125 mm., while its length 

 is "02 mm. 



Text-fio-ure 47. 



PteridopJiar^nx anisa Klialil. Head. 



' External leaf-croion. — This consists of twenty leaflets, broad at 

 their ba,se and sharp at their termination. The outline of the 

 tips of these leaflets, seen from the ventral aspect, forms a crescent, 

 being longer in the centre than at either side. 



Head pajnllce. — The four submedian head papillae are long, and 

 each surmounted with a smallknob. The latter is apparently 

 continuous with a core inside the papilla,, and presumablj^ 

 represents the duct of a head gland. ^ The two lateral papillae 

 do not project above the surface ; their terminations are marked 

 by a depression in the cuticle. 



