22 ASCAROIDEA 



Hab. Large intestine of Equidae (one species known). 



Genotype : O. \_Ascaris\ equi (Schrank, 1788). 



Schrank, 1788, Verzeichniss der . . . Ei7igeireideumrmer, 

 Miinchen, 7; Rudolphi, 1803, Arch. f. Zool. ii. Zoot., Bruns- 

 wick, iii, G ; Yorke & Macfie, 1922, Trans. R. Soc. Troji. Med. 

 Hyg., London, xv, 148. 



2, Dermatoxys Schneider, 1866. 



Lips well developed, each with a tooth projecting from its 

 inner surface. Oesophagus hourglass-shaped, with a long, 

 slender middle portion and a posterior bulb. Cervical alae 

 present. Posterior end of the male with very long well- 

 developed alae, and provided on its ventral surface in the 

 preanal region with a curving longitudinal row of comb-like 

 crests. Caudalpapillaemainly grouped around the cloaca. A 

 single spicule, very small. Accessory piece absent. Vulva 

 in the anterior half of the body. The common trunk of the 

 uterus extends posteriorly to a point beyond the anus, the 

 branches passing forward parallel to each other. Eggs with 

 a thick shell, stippled externally, slightly flattened on one 

 side and with an aperture near one pole, apparently closed 

 by a plug. 



Hab. Alimentary canal of Rodents. 



Genotype : D. {Ascaris\ veligera (Rudolphi, 1819). 



Rudolphi, 1819, Entozoorum Synopsis, 656 ; Schneider, 1866, 

 Monographie der Nematoden, Berlin, 123 ; HaU, 1916, Proc. 

 U.S. Nat. Mus., 1, 99. 



3. Hoplodontophorus Turner, 1921. 



Mouth with three lips, not very apparent, situated in a 

 shallow depression having twelve papillae round its edge. 

 Oesophagus hourglass-shaped, the anterior portion repre- 

 senting the oesophagus proper and the posterior portion the 

 bulb. A pharynx present. Tail of male with wide alae 

 supported by three pairs of papillae, one large and preanal, 

 the remaining two near the posterior end. One pair of 

 ventral papillae at the level of the cloaca. A muscular sucker 

 on the ventral surface in the preanal region, with an opening 

 in its i^osterior border. A single spicule and an accessory 

 piece. Tail of female long and slender, with rounded tip and 

 small terminal spike. Vulva in the anterior third of the body, 

 with prominent lips. Common trunk of uterus runs pos- 

 teriorly almost as far as the anus. Uterine branches parallel, 

 running anteriorly. Eggs large, elongated, flattened on one 

 side. 



Hab. Alimentary canal of Hyrax (one species known). 



Genotype : H. [Oxyuris] flagellum (Ehrenb., in Hempr. & 

 Ehrenb., 1828). 



