SPIRURINAE 213 



Hab. Intestine of Birds (one species in a Mammal). 

 Genotype : H. obesa Seurat, 1915. 



Seurat, 1915, Novit. Zool., London, xxii, 11. 



6. Histiocephalus Diesing, 1851. 



Lips large, bearing a pair of lateral ciiticular fringes with 

 a variable number of terminal processes having simple or 

 subdivided extremities. Dorsal and ventral shields present 

 as in Habronema. Neck region with a number of longitudinal 

 folds of cuticle. Tail of male with broad alae and six pairs 

 of pedunculate papillae, four preanal and two postanal. 

 Spicules equal, extremely long and filiform in the genotype ; 

 in other species markedly unequal and dissimilar. No 

 accessory piece. Vulva usually towards the anterior end of 

 the body, sometimes behind the middle. 



Hab. Beneath the lining of the gizzard of Birds. 

 Genotjrpe : H. [Spiroptera] laticaudatus (Rudolphi, 1819). 



Rudolphi, 1819, Entozoorum Synopsis, 24, 239 ; Diesing, 

 1851, Systema Helminthum, ii, 230; Gedoelst, 1919, Compt. 

 rend. Soc. Biol., Paris, Ixxxii, 1145; Skrjabin, 1916, Ann. 

 Mus. Zool., Petrograd, xx, 509; Gendre, 1921, Proc.-verb. 

 Soc. Linn. Bordeaux, Ixxiii, 49 ; and 1922, Ixxjii, 138. 



7. Hadjelia Seurat, 1916. 



Syn. Gilsonia Gedoelst, 1919. 



Head followed by a constriction. Lateral alae absent. 

 Lips trilobed. Tail of male with well-developed alae, four 

 pairs of preanal and two of postanal pedunculate papillae. 

 Spicules very unequal. No accessory piece. Vulva in 

 oesophageal region. 



Hab. Beneath lining of gizzard of Birds. 

 Genotype : H. Ihuillieri Seurat, 1916. 



Seurat, 1916, Compt. rend. Soc. Biol., Paris, Ixxix, 517 ; 

 Gedoelst, 1919, Compt. rend. Soc. Biol., Paris, Ixxxii, 1145; 

 Gendre, 1922, Proc.-verb. Soc. Linn. Bordeaux, Ixxiii, 132. 



8. Hedruris Nitzsch, 1821. 



Syn. Heteroura v. Siebold, 1836; Synplecta Leidy, 1851. 



Body stout posteriorly, slender anteriorly. Lips overlapped 

 by dorsal and ventral shields. Buccal capsule present. 

 Caudal alae of male much reduced or absent. One pair of 

 preanal and at least six pairs of postanal papiUae present. 

 Spicules short, equal. Accessory piece present or absent. 

 Posterior end of female can be invaginated to form a sucker- 

 like organ, and has a chitinized claw-like hook for attachment 



