2 ASCAROIDEA 



present. Interlabia usually well developed. Deep transverse 

 interlabial grooves run from the interlabia partially round the 

 bases of the lips. Oesophagus without bulb or ventriculus. 

 Male with four to six pairs of postanal papillae, the most 

 anterior pair frequently having double terminations. Preanal 

 papillae numerous. Spicules subequal, alate. Vulva usually 

 in posterior half of body. Genital organs in both sexes 

 usually confined to posterior region of body, which often 

 shows a fusiform thickening. Uterine branches two. 



Hab. Alimentary canal of Reptiles. 



Genotype : 0. [A scar is] filar ia (Dujardin, 1845). 



Dujardin, 1845, Histoire naturelle des Helminthes, Paris, 177, 

 653; Baylis, 1921, Parasitol, xii, 412. 



3. Polydelphls Dujardin, 1845. 



Syn. Hexametra Travassos, 1920. 



Cervical alae absent. Lips more or less hexagonal, fre- 

 quently longer than broad, usually broader at the base than 

 at the free edge. Dorsal lip usually smaller than ventro- 

 lateral lips. Pulp of ventro-lateral lips asymmetrical. 

 Interlabia absent. No interlabial grooves at bases of lips. 

 Oesophagus without bulb or ventriculus. A rudimentary 

 intestinal caecum occasionally present. Spicules subequal. 

 Caudal papillae of male as in Ojihidascaris. Vulva usually 

 in anterior region of body, rarely behind the middle. Uterine 

 branches four or six. 



Hab. Alimentary canal of Reptiles. 



Genotjrpe : P. [Ascaris] anoura. Dujardin, 1845. 



Dujardin, 1845, Histoire naturelle des Helminthes, Paris, 221 

 (as subgenus); Baylis, 1921, Parasitol., xii, 418; Baylis & 

 Daubney, 1923, Rec. Ind. Mus., xxv, 554. 



4. Toxocara Stiles, 1905. 



Sjaa. Belascaris Leiper, 1907. 



Cervical alae present, coarsely striated. Body bent ventrally 

 anteriorly. Lips with pulp forming two distinct lateral lobes 

 and an unpaired internal lobe. Interlabia absent. Oesoph- 

 agus with distinct muscular bulb posteriorly. Tail of male 

 with marked terminal digitiform appendage. Caudal alae 

 more or less well developed. On each side a group of five 

 postanal papillae on the terminal appendage (two subdorsal, 

 one lateral, two subventral), one double subventral papilla 

 between cloaca and base of appendage, and about twenty 

 preanal papillae. Spicules subequal, alate. Vulva towards 

 anterior fourth of body. Coils of female genital tubes extend 

 throughout almost whole length of body. Common trunk of 



