Description of a New Generic Form of GobinoB^ (&g. 45 



X. — Description of a New Generic Form of Gobin^ from 

 the Amazon River. 



Bt Theo. Gill. 

 Read January 31, 1859. 



Eiictenog^oliitii^, Oill. 



Body elongated, anteriorly subcylindrical, and tlience gra- 

 dually compressed towards the caudal fin. 



Scales regularly imbricated and extending forward almost to 

 the eyes ; they are moderate in size on the sides, but rather 

 small anterior to the dorsal fin ; all, inclusive of those on the neck 

 and back, are pectinated on their posterior margins, more or 

 less angular near the middle, and with their surfaces sculptured 

 with ridges diverging from the angles. 



Head naked, oblong, compressed, with the profile from the 

 eyes to the snout boldly curved. 



Fyes approximated, situated mostly in the anterior half of 

 the head. 



Mouth slightly oblique, with the cleft extending more or less 

 under the eyes. 



Teeth small, in a single row in the upper jaw, and paucispiral 

 on the lower. 



Tongue laterally dilated, truncated anteriorly, and entirely 

 attached to the floor of the mouth. 



Dorsal fins entirely disconnected ; the first triangular, the 

 second oblong. 



Caudal fin with a rounded margin. 



Pectorals rounded or subacute, with all the rays connected 

 by the membranes. 



Ventrals with the interspinal membrane low or moderate. 



This genus may very well be distinguished by the single row 

 of small teeth in the upper jaw, and by the ctenoid scales ex- 

 tending on the back to within a short distance of the eyes. But 



