226 FILARIOIDEA 



Hab. Between coats of proventricnlus of Birds. 

 Genotype : V. [iS'jj/roj)<era] e.uryoptera (Rudolphi, 1819). 



Rudolphi, 1819, Entozoorum Synopsis, 26, 248 ; Seurat, 

 1913, Bull. Soc. Hist. nat. Afriquc du Nord, Alger, v, 223; 

 Gendre, 1922, Proc.-verb. Soc. Liim. Bordeatix, Ixxiii, 132. 



7. Schistorophus Railliet, 1916. 



Syn. Tetracanthus HeunDrich & Ehrenberg, in Schneider, 

 1866, nee Hope, 1835. 



Lips produced posteriorly into two lateral cuticular flanges, 

 which are drawn out dorsally and ventrally into long points. 

 A buccal capsule present. Tail of male with lateral alae and 

 numerous preanal papillae. Spicules unequal. Vulva in 

 middle or posterior region of body. 



Hab. Beneath lining of gizzard of Birds. 

 Genotype : S. [Ancyracanthus] longicornis (Hemprich & 

 Ehrenberg, in Schneider, 1866). 



Hemprich & Ehrenberg, in Schneider, 1866, Monographie 

 der Nematoden, Berlin, 104; Railliet, 1916, Journ. Parasitol., 

 ii, 102 ; Skrjabin, 1916, Ann. Mus. Zool., Petrograd, xx, 524. 



8. Serticeps Railliet, 1916. 



Lips inconspicuous. Head ornamented with many and 

 variable appendages or festoons. Tail of male blunt, with 

 asymmetrical caudal alae and ten pairs of preanal papillae. 

 Spicules very unequal. Vulva near anus. 



Hab. Between coats of gizzard of a Bird (one species 

 known). 



Genotype : *S'. [Spiroptera] vulvoinflatus (Molin, 1860). 



Molin, 1860, Sitz. k. Akad. Wiss., Wien, xxxviii, 969; 

 Railliet, 1916, Journ. Parasitol., ii, 103. 



Appendix to Thelazhnae. 



• We place here sever?J forms whose relationships are very 

 uncertain. It is possible that the presence in all these genera 

 of an external armature of spines has led to their being 

 erroneously classified together by a number of authors, and 

 that in reality they are not at all closely related to each 

 other. The peculiar form of the buccal capsule in Ridularia 

 has not unnaturally suggested Strongyloid affinities, and Hall 

 has even referred this genus and Rictularioides to a subfamily 

 Rictulariinae of the family Metastrongylidae. We feel, how- 

 ever, that the general characters of Rictularia indicate Spirurid 

 relationships, and the Thelaziinae appear to be the group to 

 which it approaches most closely. 



