OESOPHAGOSTOMINAE 163 



15. Zoniolaimus Cobb, 1898. 



The only available description of the type of this genus is 

 contained in the figures given by Cobb, with their legend, and 

 a " formula." According to Railliet & Henry (1913, Bull. 

 Soc. Path, exot., Paris, vi, 506), the genus is synonymous with 

 Cloacina v. Linstow, and this may very possibly be the case. 

 The arrangement of the bursal rays is apparently the same in 

 both genera, but according to Cobb's figiu'es the cephalic 

 papillae in Zoniolaimus are bristle-like and slender, not club- 

 shaped ; while the oesophagus appears to possess a median 

 and a posterior bulb (possibly only dilatations of the lumen), 

 and a ring-shaped buccal capsule is not indicated. 



Hab. Alimentary canal of a Kangaroo. 

 Genotype : Z. setifera Cobb, 1898. 



Cobb, 1898, Agric. Oaz. N.S.W., Sydney, ix, 312. 



Subfam. 3. OESOPHAGOSTOMINAE Railliet, 1915. 



Buccal capsule cylindrical, or large and subglobular. A 

 transverse ventral cervical groove present. The cuticle of 

 the anterior end may be dilated to form a cephalic vesicle, 

 limited ventrally by the cervical groove. Parasites of the 

 alimentary tract of Mammals. 



1. Oesophagostomum Molin, 1861. 



SjTi. Hypostomum Stewart, 1898. 



Anterior end usually with a cuticular inflation or vesicle 

 limited behind, at about the level of the excretory pore, by a 

 transverse ventral groove. This groove extends for a varying 

 distance on to the lateral surfaces of the worm. Lateral 

 cervical alae may be present, originating at the level of the 

 groove. An external leaf-crown present. Internal leaf- 

 crown present or absent. Oesophageal funnel occasionally 

 with three teeth. Medio-lateral and postero-lateral rays of 

 bursa closely applied to each other and somewhat divergent 

 from the antero-lateral ray. Externo-dorsal arising high up 

 on the main stem of the dorsal ray, which is bifurcate in its 

 posterior two-fifths. A much-reduced accessory branch arises 

 from each of the main branches. The second pair of accessory 

 branches is occasionally represented by a minute, slender 

 branch on each side posterior to this. An accessory piece 

 present. Vulva near anus. Uterine branches parallel. 



Hab. Intestine of Mammals. 



Genotype : 0. [Strongyhis] dentatum (Rudolphi, 1803). 



Rudolphi, 1803, Arch. f. Zool. u. Zoot., Brunswick, iii, 12; 

 Molin, 1861, 3Iem. R. 1st. Veneto, ix, 435, 443; Ransom, 1911, 



