1G4 STRONGYLOIDEA 



U.S. Dept. Agric, Bur. Anim. Inclust. Bull. 127, 40; Railliet 

 & Henry, 1913, Bvll. Soc. Path. exoL, Paris, vi, 506-7. 



Railliet & Henry (1913) proposed the subgenera Proteracrum 

 and Hysteracrum for the reception of the species of this genus 

 occurring in Ruminants, while Ihle (1922, Bijdr. Dierk. Natura 

 Artis Magistra, Amsterdam, xxii, 92) has proposed a subgenus 

 Conoiveberia for the species 0. (vpiosiomum and 0. brumpti. 

 The subgenus Proteracrum, of which 0. columbianum is 

 apparently to be considered the type, differs from the type 

 of the genus in the slighty-swollen cephalic vesicle and in 

 the presence of cervical alae. Hysteracrum, with O. venulosum 

 as tyjae, differs in the post-oesophageal situation of the cervical 

 papillae. Conoiceberia is defined as having a buccal capsule 

 shaped like a truncate cone, and having three teeth in the 

 oesophageal funnel. Goodey (1924, Journ. Helminthol., ii, 

 97) has expressed the opinion that such a division into sub- 

 genera is unnecessary, and we are in agreement with this view. 



2. Ternidens Railliet & Henry, 1909. 



Ventral cervical groove present, but no cephalic vesicle. 

 External and internal leaf-crowns present. Mouth opens 

 obliquely towards the dorsal side. Buccal capsule subglobular, 

 with three j^rominent, bifid teeth projecting from the 

 oesophageal funnel. 



Hab. Intestine of Primates (one species known). 

 Genotype : T. [Triodontophorus] deminutus (Railliet & 

 Henry, 1905). 



Railliet & Henry, 1905, Bidl. Mus. Hist, nat., Paris, xi, 269 ; 

 1909, Compt. rend. Soc. Biol, Paris, Ixvi, 169; 1912, Arch. 

 Parasitol., xiv, 564, 577. 



3, Chabertia Railliet & Henry, 1909. 



Anterior end obliquely truncate, so that the mouth faces 

 antero-ventrally. Ventral cervical groove faint. A trace 

 only of a cephalic vesicle, just in front of the ventral groove. 

 Much-reduced external and internal leaf-crowns present, just 

 behind the anterior margin of the buccal capsule. Buccal 

 capsule large, subglobular, without teeth. Spicules long, 

 tubular, slender. An accessory piece present. 



Hab. Intestine of Ruminants (one species known). 

 Genotype : C. [Sirongylus] ovina (Gmelin, 1790). 



Gmelin, 1790, Syst. Nat., 13th ed., i, Pt. VI, 3044 ; Fabricius, 

 1794, Entomologia Systematica, 5 ; Railliet & Henry, 1909, 

 Compt. reml. Soc. Biol., Paris, Ixvi, 169; Ransom, 1911, U.S. 

 Dept. Agric, Bur. Anim. hidust. Bull. 127, 35. 



