156 STRONGYLOIDEA 



Type-species : T. (Cylicostomum) aegyptiacum Railliet, 1923 

 (= C tetracanthum Mehlis of Looss, 1900). 



Ihle, 1922, torn, cit., 39. 



Ic. Subgen. Cylicocyclus Ihle, 1922. 



Elements of internal leaf-crown usually small and numerous, 

 generally in the form of fine rods, originating in the immediate 

 neighbourhood of the anterior margin of the buccal capsule. 

 The posterior margin of the buccal capsule-wall forms a hoop- 

 like thickening. Tail of female straight or only slightly bent 

 dorsaUy, very seldom strongly bent. 



Type-species : T. {Cylicocyclus) [Cyathostomum] radiatum 

 (Looss, 1900). 



Ihle, 1922, torn, cit., 63. 



\d. Subgen. Cylicocercus Ihle, 1922. 



External leaf-crown composed of twenty to twenty-nine 

 elements. Elements of internal leaf-crown like those of the 

 subgenus Cylicostomum, but the region of their origin may 

 extend back to a great distance from the anterior margin of 

 the buccal capsule. Posterior end of female strongly bent 

 dorsally, with a pre-vulvar swelling, the whole somewhat 

 resembling a human foot when viewed laterally. 



Type-species : T. (Cylicocercus) [Cyathostormim] alveatum 

 (Looss, 1900). 



Ihle, 1922, torn, cit., 50. 



le. Subgen. Cylicodontophorus Ihle, 1922. 



Elements of external leaf-crown generally small and numer- 

 ous ; those of the internal leaf-crown very large and broad 

 when seen from outside. The latter are plates, radially dis- 

 posed, originating not far behind the anterior margin of the 

 buccal capsule. Buccal capsule short and wide, thick-walled. 

 Tail of female generally straight. Vxilva often rather distant 

 from anus. 



Type-species : T. (Cylicodontophorus) [Cyathostomum'] bi- 

 coronatum (Looss, 1900). 



Ihle, 1922, torn, cit., 86. 



2. Poteriostomum Quiel, 1919. 



Syn. Uexodontostomum Ihle, 1920. 



Elements of external leaf-crown numerous, those of the 

 internal leaf-crown large and broad when seen from outside. 

 Sometimes six of the latter elements are longer than the rest. 

 Postero-lateral ray of bursa has an accessory branch. The 



