TRICHONEMINAE 157 



externo-dorsal ray and the two branches of the dorsal ray 

 leave the main stem in its anterior half, and run almost at 

 right angles to it. The median dorsal ray is bifurcate only 

 as far as the point of origin of the more posterior of the two 

 pairs of accessory branches. Tail of female long, straight 

 and free from swellings. 



Hab. Large intestine of Equidae. 



Genotype : P. imparidentatum Quiel, 1919. 



Quiel, 1919, Centralbl. f. Bakt. (I), Ixxxiii, 466; Ihle, 1920, 

 Centralbl. f. Bakt. (I), Ixxxiv, 43 ; 1922, Rep. Cornm. Sclerostom. 

 Holland, I, Zool. i, 98. 



3. Murshidia Lane, 1914. 



(For questions of synonymy see discussion under Pterido- 

 pharynx, infra). 



Body tapering anteriorly. In the male the thickest portion 

 of the body may be just anterior to the bursa. Mouth-collar 

 well defined, incised dorsally and ventrally. External leaf- 

 crown composed of numerous fine elements originating along 

 a curved line which runs closer to the anterior margin of the 

 buccal capsule dorsally and ventraUy. The dorsal and ventral 

 elements are also shorter than the lateral, thus giving to the 

 mouth the shape of a dorso-ventral slit. No teeth at base of 

 buccal capsule. Antero-lateral ray of bursa divergent from 

 the remaining lateral rays. The externo-dorsal ray may have 

 a dorsal boss or a small accessory branch. It Lies relatively 

 close to the postero-lateral ray, which also is furnished with a 

 dorsal boss. Dorsal ray cleft to the origin of the accessory 

 branches, of which there are tjrpically two pairs. Spicules 

 long and slender. An accessory piece present. Vulva close 

 to anus. Uterine branches parallel. 



Hab. Alimentary tract of Elephants and Wart-hogs. 



Genot3rpe : M. murshida Lane, 1914. 



Lane, 1914, I?id. Journ. Med. Res., ii, 387. 



4. Pteridopharynx Lane, 1921. 

 SjTi. Memphisia Khalil, 1922. 



Slender forms. External leaf -crown composed of numerous 

 elements which may be of uneven length. Buccal capsule 

 more or less cylindrical, with two or more small teeth project- 

 ing from its base. The sectors of the oesophagus may be 

 plumose internally. Postero-lateral ray of bursa with a dorsal 

 boss or an accessory branch. Externo-dorsal ray typically 

 with a similar boss or accessory branch. The two pairs of 

 accessory branches of the dorsal ray fused throughout the 

 greater part of their length. Median stem of dorsal ray cleft 

 for about one-third of its length or about half-way to the 



