THELAZIINAE 225 



Hab. Orbital cavity of Birds. 



Genotype : 0. [Spirojjtera] ctphaloptera (Molin, 1860). 



Molin, 1860, Sitz. k. Akad. Wiss., Wien, xxxviii, 956; 

 V. Drasche, in Stossich, 1897, Filarie e Sjnroptere. Lavoro 

 Monografico, Trieste, 123; Railliet, 1916, Journ. Parasitol., 

 ii, 104; Skrjabin, 1916, Ann. Mus. ZooL, Petrograd, 529; 

 1916, Journ. Russe ZooL, i, 720, 744. 



4. Cystidicola Fischer v. Waldheim, 1798. 



Syii. Ophiostoma Rudolphi, 1801 ; Fissula Lamarck, 1801 ; 

 Ophiostomum Creplin, 1839; Pseudancyr acanthus Skrjabin, 

 1923, e. p. 



Lips small and pointed. A cylindrical buccal capsule 

 present. Tail of male rounded, with narrow alae. Numerous 

 double preanal papillae, and four or five pairs of postanal 

 papillae present. Spicules very unequal. Tail of female 

 blunt. Vulva in middle or anterior region. Uterine branches 

 opposed. 



Hab. Swim -bladder [rarely vascular system or oesophagus] 

 of fresh-water Fishes. 



Genotype : C. farionis Fischer, 1798. 



Fischer von Waldheim, 1798, Journ. Phi/s., etc., Paris, iv, 

 306; 1798, Bull. sci. Soc. pliilom.,Vs,Tiii, ii, 98; 1799, Arch. 

 Physiol., Halle, iii, 95 ; Leiper, 1908, Parasitol., i, 193 ; Railliet, 

 1916, Journ. Parasitol., ii, 103. 



5. Ceratospira Schneider, 1866. 



Lips inconspicuous. A short buccal capsule present. Tail 

 of male very short and blunt, with broad alae. Nine to 

 eleven pairs of preanal papillae present. Spicules very 

 unequal. Tail of female short and blunt. Vulva in anterior 

 region of body. Oviparous or viviparous. 



Hab. Orbital cavity of Birds. 



Genotype : C. vesiculosa Schneider, 1866. 



Schneider, 1866, Monographie der Nematoden, Berlin, 29, 

 108; Railliet, 1916, Journ. Parasitol., ii, 99. 



6. Viguiera Seurat, 1913. 



Anterior end covered by a circular disc with a freely pro- 

 jecting border. Buccal capsule cylindrical. Lateral alae 

 absent. Tail of male with broad, asymmetrical alae. Preanal 

 papillae asymmetrical (nine on the left side, seven on the 

 right). Two pairs of postanal papillae present, relatively 

 close to the cloaca. Spicules very unequal. No accessory 

 piece. Tail of female conical. Vulva close to anus. Uterine 

 branches parallel. 



SYN. 2SIEM. Q 



