146 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Fig. 192.— Strongylus sedecimra- 

 DiATUs. Bursa, dorsal view. 

 Enlarged. After von Lin- 

 stow, 1899. 



Location. — Intestine. 



Locality. — Ypanema, Brazil. 



The above description of the bursal rays is based on von Linstow's 



figure and its accuracy depends on the correctness. of the interpreta- 

 tion of the ventral rays. If the apparent 

 ventro- ventral ray is that and not a com- 

 bined ventro-ventral and latero-ventral 

 ray, the interpretation is as given. If 

 what appears to be the ventro-ventral ray 

 is really two rays, then the medio-lateral 

 and postero-lateral rays are close together 

 and parallel, the externo-dorsal 

 ray lies in the lateral lobe and 

 the externo-dorsal 

 ray above de- 

 scribed is merely 

 another branch of 

 t h e d o r s a 1. It 

 seems unsafe to 

 assign this species 

 generically on the 



description given. Travassos (1914^) states 



that this is a species of IleligmosoTnum.^ but 



does not give his evidence or reason for the 



statement, 



STRONGYLUS CAVALLI Parona, 1907. 



Specific diagnosis. — Trichostrongylinae (p. 

 123) : Body white, very narrow, anguilluli- 

 form in both sexes, thinning anteriorly. 

 Cuticle not striated. Anterior extremit}^ sim- 

 ple, not dilated. Esophagus not very long 

 (fig. 193). Intestine straie:ht. 



Male 10 mm. long 

 lobed, the lobes 500 to 800 yu, long. Rays dif- 

 fering slightly in length and form. Spicules 

 equal, 500 to 800 fx. long, conical, hooked at the 

 distal extremity and with two small conical 

 projections at the proximal extremity (fig. 191). 



Female 10 to 12 mm. long. The posterior third of the body is 

 thicker than the anterior portion. The tail is not very long and ends 

 in an acuminate extremity. The vulva is in the posterior fourth of 

 the body and shows as a transverse slit with raised margins. Uteri are 

 divergent (fig. 195), the posterior ovar}^ and uterus being a little 



193. 



Bursa larjre and bi- ^'^'- i93-iy5.-STRONGYLus ca- 



VALLi. 193, Anterior EXTREMITY. 

 Enlarged. After Parona, 

 1909. 191, Spicules. Eni.arged. 

 After Parona, 1909. 195, Pos- 

 terior extremity of female. 

 Enlarged. After Parona, 1909- 



