OXYUEINAE 25 



papillae near its tip. Two pairs of preanal and one pair of 

 postanal papillae also present on the lips of the cloaca, and a 

 truncate median postanal process. A single long, alate spicule 

 present. Vulva at about the posterior third of the body. 

 Female organs confined to about the middle third of the bodj^ 

 Vagina long, running anteriorlj^, then posteriorly. Common 

 trunk of uterus short, its branches turning forward near their 

 origin and parallel. Ovaries refiexed. 



Hab. Alimentary canal of an Iguana (one species known). 

 Genotype : 31. [Oxyuris] monhijstera (v. Linstow, 1902). 



V. Linstow, 1902, Centralbl. f. Bakt., xxxi, 30; Gedoelst, 



1916, Rev. Zool. Afric, 77; Rauther, 1918, Zool. Jahrb., 

 Anat., xl, 441. 



Gedoelst (1916) originally referred this genus to the Atrac- 

 tinae on the ground of v. Linstow's statement that the female 

 organs were unpaired. Following, however, Rauther's rede- 

 scription of O. monhystera, this view was abandoned. 



9. Pharyngodon Diesing, 1861. 



Cuticle rather thick, with relatively well-marked transverse 

 striations. Lips not apparent. No buccal cavity. Oesoph- 

 agus with a posterior bulb. In the male a single pair of 

 lateral alae present. In the female two parallel alae extend 

 along each lateral field. Lateral fields composed of a single 

 row of large cells with rounded nuclei. Tail of male suddenly 

 constricted at the level of the cloaca, and continued as a long, 

 dorsally-directed, conical process, the anterior portion of 

 which bears short and broad lateral alae. One pair of sessile 

 preanal papillae and two pairs of pedunculate postanal 

 papillae present. Of the latter, the posterior pair is near the 

 posterior limit of the alae. A single spicule, sharply pointed. 

 Accessory piece absent. Tail of female rather suddenly con- 

 stricted behind the anus to form a terminal spike, sometimes 

 bearing spines. Vulva postoesophageal. Uterine branches 

 narrow and parallel. Eggs very long and nan'ow, -ndth an 

 operculum at each end. 



Hab. Rectum of Lizards. 



Genotj^e : P. [Oxyuris] spinicauda (Dujardin, 1845). 



Dujardin, 1845, Histoire naturelle des Helminthes, Paris, 143 ; 

 Diesing, 1861, Sitz. k. Akad. Wiss., Wien, xlii, 642; Seurat, 



1917, Arch. Zool. exp. et gen., Paris, Ivi, 404. 



10. Tachygonetria Wedl, 1862. 



Syn. Paracis Railliet & Henry, 1916; Mehdiella Seurat, 

 1918. 



Lips not apparent. Oesophagus usually long, and with a 

 posterior bulb. Lateral alae absent. Lateral fields dark- 



