ANCYLOSTOMINAE 167 



Hab. Intestine of Mammals. 

 Genotype : A. duodenale Dubini, 1843. 



Dubini, 1843, Ann. Univ. Med., Milan, cvi, 5 ; Looss, 

 1911, Rec. Egypt. School Trop. Med., Cairo, iv, 252; Lane, 

 1916, Ind. Journ. Med. Res., iv, 76. 



Lane (1916) has proposed to divide the genus into two sub- 

 genera, Ancylostoma for forms with three pairs of ventral 

 teeth, viz. A. duodenale and A. caninum ; and Ceylancylostoma 

 for forms with two pairs, viz. A. ceylanicum and ^. malayanum. 

 He considers that the form of the lateral rays of the bursa is 

 correlated with the number of ventral teeth. The subdivision 

 of the genus, however, appears unnecessary. 



2. Galoncus Railliet, 1918. 



Anterior end bent dorsally. Mouth-opening guarded by 

 two or three pairs of ventral teeth. Buccal capsule very 

 much reduced in size, cup-shaped and imperfectly chitinized, 

 with one or two pairs of teeth towards its base. Bursa with 

 a small dorsal lobe. Externo-dorsal ray arises from the 

 main stem of the dorsal ray. The cleft portion of the dorsal 

 ray is extremely short in comparison with its total length. 

 Its terminations are tridigitate, i.e. there are two accessory 

 branches on each branch. Spicules long, filiform, apparently 

 united at their tips. An accessory piece present. Vulva 

 towards the posterior fourth of the body. Uterine branches 

 opposed. 



Hab. Submucous cysts in the intestine of Felidae. 

 Genotype : G. [Ankylostomum] perniciosus (v. Linstow, 

 1885). 



v. Linstow, 1885, Arch. f. Naturg., li, i, 238; Railliet, 1900, 

 Arch. Parasitol., Paris, iii, 91 ; 1918, Bull. Soc. Path, exot., 

 Paris, xi, 82. 



3. Agriostomum RaiUiet, 1902. 



Mouth-opening circular, guarded by four pairs of marginal 

 teeth. Dorsal gutter ends in a cone, bifid at its tip and 

 projecting freely. In front of the teeth there are indications 

 of a primitive leaf-crown. Buccal capsule short, more or less 

 cylindrical. Oesophageal funnel much dilated, with thickened 

 wall. The buccal capsule proper and the oesophageal funnel 

 together have much the shape of the buccal capsule of a 

 typical Ankylostome. Antero-lateral ray of bursa thicker 

 than, and somewhat divergent from, the remaining lateral 

 rays. Externo-dorsal rays spring from the median dorsal 

 stem about half-way between its root and its bifurcation. 

 Dorsal ray cleft for about one-third of its length. Its ter- 

 minations are bidigitate. Spicules equal, alate. An accessory 



