404 Annals OF the Carnegie Museum. 



Maxillary barbel extending to tip of ventrals or origin of anal; 

 mental barbels to base of pectoral, postmental very little shorter. 

 Lower jaw scarcely included, snout rounded; upper jaw sharp-edged, 

 a single series of teeth along the edge, lower jaw with about two series 

 of teeth in front, with a single series on the side. 



Posterior margin of the occipital bordered by a deep groove, a sub- 

 parallel groove a little further back; top of head hard, reticulated, or 

 pitted; dorsal plate without downward processes behind; origin of 

 dorsal one-half as far from the snout as from the caudal, dorsal spine 

 a trifle longer than head without the opercle, its anterior margin 

 smooth, its posterior with minute hooks. Base of adipose equals eye 

 or shorter; caudal forked, its middle rays half or two-thirds as long as 

 the outer rays, which are 3.3-3.5 in the length; anal margin sloping, 

 not emarginate; ventrals free from the belly, not reaching anal, about 

 equal to the snout and eye; pectoral spine strong, as long as, or but little 

 shorter than, the head, with about fifteen graduate recurved thorns 

 along its posterior margin from the tip to near the base. Anterior 

 margin with a similar number of shorter graduate teeth, more strongly 

 antrorse than the posterior are retrorse. Humeral spine about reaching 

 middle of the pectoral spine. Fontanel as long as the eye. Occipita 

 and forward to fontanel black; a black ring surrounds the base of the 

 dorsal, most marked at the predorsal fulcrum and continued along the 

 back to the base of the caudal as a brown streak; sides and below 

 silvery; tips of caudal lobes, especially the upper, usually with some 

 dark. 



