8 ASCAROIDEA 



of the lips. Oesophagus with a small ventricnlus, from which 

 spring two anterior and three posterior caeca. An intestinal 

 caecum present. An accessory piece present. 



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

 Genotype : 31. [Ascaris] agile (Wedl, 1862). 



Wedl, 1862, SUz. k. Akad. Wiss., Wien, xliv, 467 ; Baylis, 

 1923, Parasitol, xv, 230. 



10. Angusticaecum Baylis, 1920. 



Lips with dentigerous ridges. Interlabia absent. Oesoph- 

 agus without ventricnlus or distinct bulb. No oesophageal 

 caecvim. A long slender intestinal caecum present. 



Hab. Intestine of land Tortoises and ( ?) Batrachians. 

 Genotype : A. [Ascaris] holopterum Rud., 1819. 



Rudolphi, 1819, Entozoorum Synopsis, 53, 295; Baylis, 

 1920, Parasitol., xii, 262. 



Baylis (1920) referred Porrocaecum numidicum Seurat, 1917, 

 from Rana, to this genus. In spite, however, of the stated 

 absence of interlabia it seems more probable that it is referable 

 to Amj)licaecum. We have seen specimens belonging appar- 

 ently to the latter genus from a frog and from a crocodile. 

 Those from the frog were similar to, though probably not 

 identical wdth, Seurat's species. 



11. Araplicaecum Baylis, 1920. 



Lips with dentigerous ridges. Small interlabia present. 

 Oesophagus without ventricnlus or distinct bulb. No oeso- 

 phageal caecum. A wide intestinal caecum present. 



Hab. Alimentary canal of carnivorous Birds and Reptiles. 

 Genotype : A. {Ascaris] colurum (Baylis, 1919). 



Baylis, 1919, Ann. Mag. Nat. Hist., (9) iii, 457; 1920, 

 Parasitol., xii, 262. 



12. Crossophorus Ehrbg., in Hemp. & Elirbg., 1828. 



Lips separated from neck by a distinct constriction, which 

 is occupied by a collar consisting apparently of a double tow 

 of fimbriae. In reality these fimbriae form a single endless 

 chain, which doubles on itself at the centre of the base of each 

 lip externally and passes across the inner surface of the lip. 

 In addition to these each lip also has an interrupted dentigerous 

 ridge. No interlabia. Oesophagus with " gizzard " anteriorly, 

 containing a chitinoid masticatory apparatus, and with a 

 posterior musciilar bulb. Two long intestinal caeca present. 

 No oesophageal caecum. Tail of male very blunt. Postanal 

 papiUae in two parallel rows on either side. Preanal papillae 



