154 STRONGYLOIDEA 



almost to their bases. Main stem of dorsal ray cleft for less 

 than half its length. An accessory piece present. Tail of 

 female short and straight. Vidva close to anus. Uterine 

 branches parallel. 



Hab. Intestine of Elephants. 



Genotype : C. [Sclerostomujn] e.pistomiim (Piana & Stazzi, 

 1900). 



Piana & Stazzi, 1900, Arch. Parasitol., Paris, iii, 467 ; 

 Railliet, Henry & Bauche, 1914, Bull. Soc. Path, exot., Paris, 

 vii, 207; Lane, 1914, Ind. Journ. Med. Res., ii, 384. 



8. Ransomus Hall, 1916. 



Anterior end obliquely truncate, so that the mouth faces 

 antero-ventraUy. External leaf-crown present. Buccal 

 capsule large, subglobular, without internal teeth. Antero- 

 lateral ray of bursa arises separately from the medio-lateral 

 and postero-lateral. The latter rays are fused for about half 

 their length. Externo-dorsal ray also originates separately. 

 The dorsal ray gives off a pair of accessory branches, and 

 almost immediately behind these the main stem bifurcates. 

 The cleft portion of the main stem represents approximately 

 a quarter to a third of the length of the whole ray. Spicules 

 long, tubular, markedly alate. An accessory piece present. 

 Vulva a little in front of anus. Uterine branches opposed. 



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

 Genotype : R. rodentorum [sic] Hall, 1916. 



HaU, 1916, Proc. U.S. Nat. Mus., 1, 116. 



Subfam. 2. TRICHONEMINAE Railliet, 1916. 



Buccal capsule cylindrical, with relatively thick walls. 

 Dorsal gutter comparatively short, not reaching the anterior 

 margin of the buccal capsule. No ventral cervical groove 

 or cephalic vesicle. Parasites of the alimentary tract of 

 Vertebrates. 



1. Trichonema Cobbold, 1874. 



Syn. Cyathostomum Molin, 1861, nee Cyathostoma E. Blan- 

 chard, 1849; Cyathostomum Looss, 1900; Cylicostomum 

 RaiUiet, 1901, et auctt. ; Cylichnostomum Looss, 1902. 



External and internal leaf-crowns present. Buccal capsule 

 rather shallow, more or less cylindrical, without teeth. 

 Oesophageal funnel generally well developed. Dorsal ray of 

 bursa bifurcate almost to the point of origin of the externo- 

 dorsal rays. The two pairs of accessory branches of the 

 dorsal ray spring from the bifurcate portion and not from the 

 median stem. Genital cone with a well-developed dermal 



