SOUTH AMERICAN NEMATOGNATHI. 199 



short, stout and recurved, the teeth of the inner slender, 

 straight arid freely depressible; teeth on the anterior 

 half of the vomer car- 

 diform, those of the 

 inner half and those of 

 the palate much small- 

 er, villiform; teeth of 

 the lower jaw similar 

 to those of the inter- 

 maxillary, but the dif- 

 ference not so marked 

 between the anterior and posterior portions of the band. 



Gill-rakers wide set, little overlapping, the longest 

 scarcely shorter than the long diameter of the eye, 5+11. 



Dorsal spine inserted slightly nearer base of ventral 

 than to base of pectoral, its distance from snout equal- 

 ling that to the end of the first third of the adipose fin. 

 Dorsal spine without teeth produced in a filament, its 

 length, including filament, 1J in head, first ray scarcely 

 shorter, the fin emarginate. 



Adipose fin about as long as the anal. 



Caudal fin very deeply forked, the lobes long and 

 pointed, the upper ending in a long filament in one ex- 

 ample; the lobe, including filament, which seems to 

 have been broken off, being more than half the length 

 of the body. 



Ventrals reaching about one-fourth their length be- 

 yond vent, li-lf in head. Vent 8 diameters of the eye 

 in advance of the anal. 



Pectoral spine roughened in front, recurved teeth on 

 the upper portion behind, its length about 2 in head. A 

 pectoral pore. Humeral process short, covered with 

 skin. The skin of the whole side of the body reticulated 

 and very porous with minute pores. 



Color silvery, with a bluish to bronze or copper lustre 

 above. 



