NO. 2131. NEBIATODE PARASITES OF RODENTS— HALL. 115 



Bursa with dorsal lobe projecting posteriorly beyond the lateral 

 lobes. Ventro-ventral and latero-ventral rays close together and 

 parallel and originating in a common trimk with the lateral rays, 

 the latter mutually divergent. The externo-dorsal ray is widely 

 separated from the lateral rays and originates from the dorsal trunk 

 or from one of the paired dorsal rays near its origin. The two long 

 dorsal rays give off two branches externally. In some species the 

 dorsal rays may present the appearance of being fused in the median 

 line to form a single dorsal ray with a bifurcate tip. The equal 

 spicules are long and slender. The vulva is a short distance in front 

 of the anus. 



Type-species. — Eucyathostomfii'nh longesiihiilatuTn Molin, 1861a.. 



EUCYATHOSTOMUM COPULATUM Molin. i86ia. 



Synonyms. — Encyathostomum copulatum Molin, 1861a; Strongy- 

 lus cohaerens Schneider, 1866; Sclerostoinvm copidatiwi (Molin, 

 1861a) Stossich, 1899. 



/Specific diagnosis. — Eucyathostomum (p. Ill) : Head truncate, con- 

 tinuous with body, and provided with four large spinelike papillae 

 and two small ones. INIouth caliciform and provided internally 

 with a corona radiata. Body abruptly attenuated at both ends. 

 Cuticle densely striated transversely. Male and female always 

 found attached in permanent copulation at right angles. 



Male 3.5 to 5 mm. long and 200 ju thick. Two very long filiform 

 spicules. 



Female 5 to 9 mm. long and 500 fx thick. Caudal extremity subu- 

 late. Anus prominent and remote from the posterior end of the 

 body. Vulva just anterior of anus. 



Host. — Dasyprocta aguti. 



Location. — Cecum. 



Localities. — Caicara and Ypanema, Brazil. 



Schneider and Molin have both studied this species and neither 

 has described the bursa, Schneider stating that the union of the male 

 and female was so firm that he could not separate them for study. 

 The two workers have put the species in different genera, but I have 

 followed the author of the genus EucyathostomziTn in placing it in 

 that genus. It may not belong there. Molin noted that the male 

 was attached to the mucosa and the female hung free in the intes- 

 tinal lumen. 



RANSOMEAE Hall, 1916, new tribe. 



Trihe diagnosis. — Strongylinae (p. 107) : Ventro-ventral and latero- 

 ventral rays close together and parallel. Medio-lateral and postero- 

 lateral rays divergent. Dorsal and externo-dorsal rays originate sep- 

 arately. Vulva close to anus and uteri divergent. 



Type-genus. — Ransornus Hall, 1916. 



