THELAZIINAE 227 



9. Spinitectus Founuent, 1883. 



Body armed with transverse rings, closer together anteriorly, 

 bearing backwardly-directed spines. Head retractile. Lips 

 small and pointed. A short buccal capsule present. Tail of 

 male bluntly rounded, with narrow alae. Caudal papillae in 

 one species four pairs preanal and five or six pairs postanal ; 

 in another species papillae said to be absent. (Male of geno- 

 type unknown). " Denticulate crests " sometimes present in 

 front of the cloaca. Spicules very unequal. Vulva in middle 

 or posterior region of body. Uterine branches opijosed. 

 Eggs in genotype with polar filaments. 



Hab. Alimentary canal of Fishes. 

 Genotype : S. oviflagellis Fourment, 1883. 



Fourment, 1883, Compt. rend. Soc. Biol., Paris, xxxv, 

 678; 1884, Ann. Sci. nat., Paris, Zool., xvii, 1; Railliet & 

 Henry, 1915, Bull. Soc. Path, exot., Paris, viii, 274; Ward 

 & Magath, 1917, Journ. Parasitol., iii, 61. 



In the absence of a full description of the genotype the 

 position of this genus remains doubtful. 



10. Rictularia Frolich, 1802. 



Syn. Laphyctes Dujardin, 184.5; Pieri/godermatites Wedl, 

 1861. 



Cuticle of body armed on each side with two longitudinal 

 subventral roMS of large, flattened, comb-like spines, at least 

 in the anterior region, the spines becoming scarcer and dimin- 

 ishing in size posteriorly. Mouth subterminal, opening 

 dorsally by a transversely elongated aperture bordered by 

 small denticles. A small, well-chitinized buccal capsule 

 present, armed at its base with teeth and spines. Oesophagus 

 simple, slightly club-shaped. Caudal end of male conical, 

 with or without somewhat bursa-like alae. Several pairs of 

 preanal and postanal papillae present. Spicules short, equal or 

 unequal. An accessory piece present. Vulva near the posterior 

 end of the oesophagus. Uterine branches parallel, running 

 posteriorly. Oviparous. Eggs contain embr3fos when laid. 



Hab. Small intestine of Carnivores, Bats and Rodents. A 

 single species recorded from a Lizard. 

 Genotjrpe : R. cristata Frolich, 1802. 



Frolich, 1802, NaturforscJier, Halle, xxix, 7 ; Jagerskiold, 

 1909, Res. Swed. Zool. Exp. Egypt, No. 25, 41 ; Hall, 1916, 

 Proc. U.S. Nat. Mus., \, 168. 



11. Rictularioides Hall, 1916. 



Mouth terminal, surrounded by four conical anterior pro- 

 jections, united in pairs by membranes so as to form two 



