158 PROCEEDINGS OF tHE NATIONAL MUSEUM. vol.50. 



I am indebted for this material also to the kindness of Mr. E. R. 

 Warien. The worms were collected from host material collected by 

 him and preserved in alcohol. 



Genus VIANNAIA Travassos, 19146. 



Synonyms. — Strongylus Mueller, 1780, part; M etastrongylus Mo- 

 lin, 1861«, part; Ileligmosomum Railliet and Henry, 1909«, part. 



Generic diagnosis. — Heligmosominae(p. 148) : Body strongly rolled 

 in a spiral, with slight transverse striations and without evident lon- 

 gitudinal striations. Cuticle enormously thickened, especially in the 

 male. Spicules short; gubernaculum present or absent, and only 

 slightly visible when present. Vulva only slightly anterior of the 

 anus. Ovijector well developed. Single uterus and ovary. In 

 small intestine of rodents and marsupials. 



Type-species. — Viannaia viannm Travassos, 1914&. 



ANALYTICAL KEY TO SPECIES OF VIANNAIA. 



1. Worms less than 3 mm. long Viannaia hydroeJieri, p. 158. 



Worms 6 mm. long or longer : Viannaia polygyra, p. 158. 



VIANNAIA HYDROCHERI Travassos, 1914&. 



Specific diagnosis. — Viannnia (p. 158) : Body red and rolled in a 

 spiral. Cuticle very thick. Esophagus claviform and 310 11 long. 



Male 2.3 to 2.4 mm. long and 150 ju, thick. Large bursa with well 

 developed lateral lobes. Ventro- ventral and latero- ventral rays di- 

 vergent and medio-lateral and postero-lateral rays divergent. Dor- 

 sal ray branches dichotomously. Spicules characteristic, of about 

 the same size, 170 to 180 /* long, but slightly differing in shape; no 

 gubernaculum. 



Female 1.9 mm. long and 120 11 thick. Vulva 71 /a from the' tip of 

 the tail. A single uterus with few eggs; eggs 42 to 49 /* by 28 to 35 /x 

 in diameter. 



Host. — IJydrochoerus hydrochaeris {Ilydrocherus capihara). 



Location. — Small intestine. 



Locality. — Estado do Rio, Angra dos Reis, Brazil. 



Lylfe history. — UnknoAvn. 



It would have been better if Travassos had elaborated or illustrated 

 his statement that the spicules are characteristic. 



VIANNAIA POLYGYRA (Dujardin, 1845) Hall, 1916. 



Synonyms. — Strongylus poly gyrus Dujardin, 1845 ; Metastrongy- 

 lus polygyrus Dujardin (1845) Molin, 1861«; Strongylus spirogyrus 



