SOUTH AMERICAN NEMATOGNATHI. 285 



process long and strong, naked; its surface more strongly 

 granulated than the bones of the head. Pectoral pore 

 moderate. 



Lateral line almost straight, with two series of pores, 

 each pore in the center of a white dot. 



Distance of the dorsal spine from snout 2-f in the 

 length; the spine scarcely shorter than the head, its 

 sides striate, its anterior margin serrate, its posterior 

 margin roughened; the first soft ray higher than the 

 spine. Distance between the dorsal and adipose fins 2J- 

 in the length. 



Caudal fin slightly emarginate, the upper lobe some- 

 what longer, about 4 in the length. Anal fin low. Ven- 

 trals fins broad and short, 1| in the head. 



Pectoral spine compressed, serrate on both margins, 

 longer than the dorsal spine. 



Color dark brown; fins all more or less dusky, margin 

 of caudal and anal lighter; ventral surface white; chin 

 dark brown. 



Head 4J;. depth 5; D. I, 6; A. 21; V. 10; P. I, 8. 



Two specimens, .07-. 18 m. Maues, Rio Madeiro; 

 Cameta. Agassiz. The description has been taken 

 from the larger specimen. 



L. FELICHTHYS. 



Felichthys Swainson, Fish. Amph. & Kept, ii, 305, 1839 

 (sp). 



Felichthys Swain, Proc. Acad. Nat. Sci. Phila. 281, 1882 

 (nodosus). 



Pseudauchenipterus Bleeker, Nederl. Tijdschr. Dierk. i, 

 88, 1863 (nodosus). 



Type: Silurus nodosus Bloch. 



The forked caudal and emarginate anal, combined 

 with other characteristics, seem to us to be of generic- 

 value, especially as species besides nodosus have been 

 discovered with the same combinations. 



