152 STRONGYLOIDEA 



2. Triodontophorus Looss, 1902. 



Syn. Triodontus Looss, 1900, nee Westwood, 1845. 



External and internal leaf-crowns present, their elements of 

 equal number. Buccal capsule almost globular, rather small, 

 but with relatively thick walls. Dorsal gutter present. From 

 the oesophageal funnel three pairs of teeth project into the 

 buccal capsule. Spicules terminate in small hooks. Vulva 

 relatively close to the posterior end of the body. Uterine 

 branches parallel. 



Hab. Large intestine of Equidae. 



Genotype : T. [Triodo7itus] yninor (Looss, 1900). 



Looss, 1900, Centralbl. f. Bakt., (I), xxvii, 153; 1902, Rec. 

 Egypt. School Trop. Med., Cairo (1901), 78; Ihle, 1922, Rep. 

 Comm. Sclerostom. Holland, I, Zool. i, 26. 



3. Craterostomum Boulenger, 1920. 



This genus differs from Triodontophorus in the absence of 

 teeth in the oesophageal fumiel, in the fact that the elements 

 of the external leaf-crown are fewer in number than those of 

 the internal leaf -crown, and in the somewhat more anteriorly 

 placed vulva. 



Hab. Large intestine of Equidae. 



Genotype : C. [Cylicostomurn] acuticaudatum (Kotlan, 

 1919) (= C. tenuicaudatum Boulenger, 1920). 



Kotlan, 1919, Kozlem. osszehas. elet-es kortan korebol, 

 Budapest, XV; Boulenger, 1920, ParasitoL, xii, 105; Ihle, 

 1922, Rep. Comm. Sclerostom. Holland, I, Zool. i, 33. 



4. Codiostomum Railliet & Henry, 1911. 



External and internal leaf-crowns present. Buccal capsule 

 large, subglobular, without teeth, but with a weU-developed 

 dorsal gutter. Dorsal lobe of bursa placed almost at right 

 angles to the main axis of the body. Prebursal papillae 

 present, situated in the bvirsa itself. Lateral and ventral rays 

 appear to arise from a common trunk. Externo-dorsal leaves 

 dorsal ray very high up, almost at its root. Dorsal ray cleft 

 for about half its length. An accessory branch, which divides 

 into two, leaves each branch of the main stem high up. 

 Accessory piece absent. Vulva close to anus. The cuticle in 

 the neighbourhood of the vulva may be inflated to form a 

 sheath over a portion of the tail. Uterine branches parallel. 



Hab. Caeca of Ostrich (one species known). 

 Genotype : C. [Schrostoma] struthionis (Horst, 1885). 



Horst, 1885, Notes Leyden Mus., vii, 263 ; Railliet & Henry,, 

 1911, Btdl. Soc. nat. Acclim., Paris, 574; Monnig, 1924, 



