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 24 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 2;V 

 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, 14 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. 



Head4J; 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. & Rept. ii, 305, 1839 

 (sp). 



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

 (no(hsus). 



PseAulauchenipterus Bleeker, Nederl. Tijdschr. Dierk. i, 

 88, 1863 (nodosns). 



Type: Siluriis nodosus Bloch. 



The forked caudal and emarginate anal, combined 

 with other characteristics, seem to us to be of generic 

 value, especially as species besides nodosns have been 

 discovered with the same combinations. 



