50 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



of the worm. The spicules are nearly equal, 470 /x long. The guber- 

 naculum is 136 [j. long. The cloacal aperture is 279 /i, from the poste- 

 rior end. 



Female 16 mm. long by 400 ix thick. The vulva is anterior to the 

 middle of the body. Eggs ellipsoidal, 43 by 31 ju, in diameter, not 



Fig. 56.— Paraspidodera 

 UNCiNATA. Posterior 



EXTREMITY OF MALE; 

 VENTRAL VIEW. ENLARG- 

 ED. After Travassos, 

 1914. 



Fig. 57.— Paraspidodera ttncinata. Posterior ex- 

 tremity OF male; lateral view. Enlarged, 

 After Travassos, 1914. 



segmenting when oviposited. Anus 1.198 mm. from the posterior end 

 of the body. 



Host. — Cavia fovcellus. 



Location. — Cecum and colon. 



Locality. — Brazil. 



The species described here, according to Travassos (1914«), "are 

 considered to belong to II. uncinata Rudolphi, as they are of the 

 same size, besides having also a long sidecrest." On comparing Tra- 

 vassos's figures and description with those for Ileterakis uncinata 

 given by Schneider (1866), I am unable to agree with this finding. 

 It is true that the worms are of about the same size and that they 

 both have lateral alae. It is also true that Schneider states that he 

 had only a few poorly preserved specimens and that his description 

 was consequently incomplete. But Schneider figures a long, fusi- 



