224 FILARIOIDEA 



Subfam. 5. THELAZIINAE nov. 

 (= Fam. Thelaziidae Railliet, 191C.) 



Lips inconspicuous. Dorsal and ventral cuticular shields 

 absent. Buccal capsule not well developed, without annular 

 or spiral thickenings in its wall. Tail of male typically with 

 numerous preanal papillae. Accessory piece usually absent. 



1. Thelazia Bosc, 1819. 



Cuticle with coarse striations, resembling in profile the 

 teeth of a saw. Lips inconspicuous. A buccal capsule present, 

 having its anterior edge turned back and cut into six festoons. 

 Tail of male short, without alae. Preanal papillae numerous, 

 including an unpaired precloacal papilla. Three or four pairs 

 of postanal papillae present. Spicules vmequal. Tail of 

 female bluntly rounded. Vulva in anterior region of body. 

 Uterine branches parallel, running posteriorly. Viviparous. 



Hab. Lachrymal canals of Birds and Mammals. 

 Genotype : T. [Thelazius] rhodesii (Desmarets, 1828). 



Bosc, 1819, Journ. Phys., etc., Paris, Ixxxviii, 215; Des- 

 marets, 1828, Veterinarian, London, i, 79 ; Railliet & Henry, 

 1910, Compt. rend. Soc. Biol, Paris, Ixviii, 213; Railliet, 

 1916, Journ. Parasitol., ii, 99. 



2. Rhabdochona Railliet, 1916. 



Syn. Pseudancijr acanthus Skrjabin, 1923, e. -p. ; ? Ichthyo- 

 spirura Skrjabin, 1917. 



Lips small. Buccal cavity funnel-shaped anteriorly, and 

 supported in this region by longitudinal ribs, which project 

 as teeth anteriorly. Tail of male conical, without alae. 

 Numerous preanal and five or six pairs of postanal papillae 

 present. Spicules unequal. Vulva in middle region of body. 

 Uterine branches opposed. 



Hab. Litestine of fresh-water Fishes. 



Genotype : R. [Dispharagus] denudata (Dujardin, 1845). 



Dujardin, 1845, Hist. nat. des Helminthes, Paris, 81 ; RaiUiet, 

 1916, Journ. Parasitol., ii, 104; Gendre, 1922, Proc.-verb'. 

 Soc. Ijinn. Bordeaux, Ixxiii, 148. 



3. Oxyspirura v. Drasche, in Stossich, 1897. 



Lips inconspicuous. Mouth surrounded by a small cuticular 

 ring. A short buccal capsule present. Cervical alae may be 

 present. Tail of male laterally compressed, without alae. 

 A very variable number of sessile papillae present, often asjrm- 

 metrical. Preanal papillae sometimes absent. Spicules very 

 unequal. Vulva in posterior region of body. 



