34 ASCAROIDEA 



are eversible, and when inverted are lodged in the anterior 

 part of the lumen of the oesophagus. Behind the lips a 

 cuticular collar bearing a pair of prominent horn-like lateral 

 papillae. Tail of male bluntly conical. Up to ten pairs of 

 rather small caudal papillae present. Spicules unequal. No 

 accessory piece. Tail of female narrows suddenly behind 

 the anus and tapers to a fine point. 



Hab. Alimentary canal of Perissodactyle mammals. 

 Genotype : C. [Pterocephalus] viviparus (v. Linstow, 1899). 



V. Linstow, 1899, 3Iitt. Zool. Miis., Berlin, i, 12; Railliet, 

 1909, Rec. Med. Vet., Paris, Ixxxvi, 336; Gedoelst, 1916, Rev. 

 Zool. Afric, V, 1 ; Baylis, 1919, Ann. Mag. Nat. Hist. (9) iv, 94 ; 

 Yorke & Southwell, 1920, Ann. Trap. Med., Liverpool, xiv, 127. 



4. Rondonia Travassos, 1920 (?). 



Spicules subequal. A cloaca present in both sexes. 



Hab. Alimentary canal of freshwater fishes (one species 

 known). 



Genotype : R. rondoni Travassos, 1920 ( ?). 



Travassos, 1920 ( ?), Rev. Vet. e Zootech., Rio de Janeiro, 62. 



5. Cobboldina Leiper, 1911. 



Syn. Cobboldia Leiper, 1910. 



Lips not apparent. Mouth surrounded by a cuticular collar 

 with median dorsal and ventral prolongations. The collar is 

 supported by four finger-like papillae, the lateral pair longer 

 than the median. Length of the posterior oesophageal bulb 

 and its " neck " almost twice that of the oesophagus proper. 

 Tail of male long and tapering. Nine pairs of sessile caudal 

 papillae present, of which four are postanal. Spicules unequal. 

 No accessory piece. 



Hab. Stomach of Hippopotamus (one species known). 

 Genotype : C. [Cobboldia] vivipara (Leiper, 1910). 



Leiper, 1910, Proc. Zool. Soc, London, 235 ; 1911, Proc. Zool. 

 Soc, London, 555 ; Gedoelst, 1919, Compt. rend. Soc. Biol., 

 Paris, Ixxxii, 912. 



6. Cyrtosomum Gedoelst, 1919. 



Mouth hexagonal, with six lips. No buccal capsule. Tail 

 of male conical. Six pairs of caudal papillae present, of which 

 three are preanal and three postanal, near the tip of the tail. 

 Si^icules equal, sharply pointed. Accessory piece absent. 



Hab. Alimentary canal of a Lizard (one species known). 

 Genotype : C. scelojMri Gedoelst, 1919. 



Gedoelst, 1919, Compt. rend. Soc. Biol., Paris, Ixxxii, 910. 



