NECATORINAE 173 



Baylis & Daubney, 1923, Ann. Mag. Nat. Hist., (9) xi, 334; 

 1923, Rec. hid. Mus., xxv, 573. 



9. Acheilostoma Leiper, 1911. 



Mouth-opening slightly tilted dorsally. Buccal capsule 

 fairly large, subglobular. At its base a dorsal cone, which 

 may carry also two smaller lateral lancets, and two pairs of 

 subventral lancets. Antero-lateral ray of bursa divergent 

 from the remaining lateral rays, which are closely applied 

 to each other. Externo-dorsal rays spring from median stem 

 of dorsal ray. Dorsal ray cleft for at least two-thirds of its 

 length ; its terminations bidigitate. Spicules long and filiform. 

 No accessory piece. Vulva near middle of body. 



Hab. Intestine and gall-bladder of Rodents. 

 Genotype : A. simpsoni Leiper, 1911. 



Leiper, 1911, Proc. Zool. Soc, London, 549; Railliet, 1918, 

 Bull. Soc. Path, exot., Paris, xi, 97. 



10. Grammoeephalus Railliet & Hemy, 1910. 



Buccal capsule wide anteriorly and narrowed posteriorly, 

 the narrowing being more abrupt on the dorsal wall and 

 accompanied by an infolding of the capsule. Towards the 

 base of the capsule a pair of lateral and a pair of subventral 

 teeth, also a dorsal cone carrying the dorsal gutter. Intestine 

 with a long, anteriorly-directed dorsal caecum arising close 

 to its union with the oesophagus. Externo-dorsal rays of 

 bursa spring from median stem of dorsal ray just in front of 

 its division. Terminations of dorsal ray bidigitate. Spicules 

 stout, alate. Vulva close to the middle of the body. 



Hab. Bile-ducts of Elephants. « 



Genotype : G. [Sclerostoma] dathratus (Baird, 1868). 



Baird, 1868, Proc. Zool. Soc, London, 262 ; Railliet & Henry, 

 1910, Bull. Soc. Path, exot., Paris, iii, 313; Lane, 1921, Ind. 

 Journ. Med. Res., ix, 163. 



11. Bathmostomum Railliet & Henry, 1909. 



Buccal capsule fissured on its dorsal and lateral aspects. 

 Its internal surface raised, chiefly ventrally and laterally, into 

 shelf-like projections encroaching on the oral cavity. A small 

 dorsal tooth siu'mounts the dorsal column of the oesophagus. 

 Externo-dorsal rays of bursa spring from the branches of 

 the dorsal ray. The latter is cleft for almost the whole of 

 its length. Spicules stout. Vulva near the middle of the 

 body. 



Hab. Caecum of Elephants (one species known). 

 Genotype : B. [Dochmius] Sanger i (Cobbold, 1879). 



