TRICHONEMINAE 161 



Buccal capsule shallow, cylindrical, with thick walls. Pre- 

 bursal papillae of male appear as an additional pair of ventral 

 rays within the bursa. Externo-dorsal rays originate high 

 up on the median dorsal stem. Dorsal ray with one pair 

 of accessory branches, also arising high up on the median stem. 

 The tips of these branches may be bifurcate. Spicules 

 broad, alate, and twisted distaUy. An accessory piece present. 

 Vulva near the anus. Uterine branches parallel. 



Hab. Alimentary tract of Rhinoceroses. 



Genotype : K. [Deletrocephalus] stylosa (v. Linstow, 1907). 



V. Linstow, 1907, Mitt. Zool. Mus. Berlin, iii, 254 ; Skrjabin, 

 1916, Sci. Res. Zool. Exp. Brit. E. Africa (Dogiel and Sokolow), 

 Petrograd, i (4), 44. 



10. Cylindropharynx Leiper, 1911. 



External leaf-crown composed of six very large elements, 

 three on each side. Dorsally and ventrally there projects 

 from the mouth-opening a broad plate directed towards the 

 main axis of the body. Internal leaf-crown consists of twelve 

 large elements, arising from the anterior margin of the buccal 

 capsule. Buccal capsule extremely long, cylindrical, thick- 

 walled. Dorsal ray of bursa cleft almost to origin of externo- 

 dorsal rays. An accessory branch, bifurcate at its tip, 

 springs from each of the main branches of the dorsal ray. 



Hab. Large intestine of Equidae. 

 Genotype : C. brevicauda Leiper, 1911. 



Leiper, 1911, Proc. Zool. Soc, London, 551; Yorke & 

 Macfie, 1920, Ann. Trop. Med. Parasit., Liverpool, xiv, 169; 

 Ihle, 1922, Rep. Comm. Sclerostom. Holland, I, Zool. i, 108. 



11. Trachypharynx Leiper, 1911. 



An external leaf-crown present. The anterior third of the 

 buccal capsule is thickly reinforced with chitinoid material. 

 The posterior two-thirds are surrounded by the oesophageal 

 musculature and thinly lined with chitinoid material bearing 

 internally-projecting knobs. Vulva a little in front of anus. 



Hab. Intestine of a large Rodent (one species known). 

 Genotype : T. nigeriae Leiper, 1911. 



Leiper, 1911, Proc. Zool. Soc, London, 552; Hall, 1916, 

 Proc. U.S. Nat. 3Ius., 1, 109. 



12. Eucyathostomum Molin, 1861. 



Buccal capsule large, with wide anterior opening whose 

 internal border is armed with a leaf-cro^vn consisting of 

 numerous slender, pointed elements. Bursa with projecting 

 dorsal lobe. Ventral and lateral rays arising from a common 

 trunk. The ventral rays may be fused. Dorsal ray may be 



SYN. NEM. M 



