46 CALIFORNIA ACADEMY OF SCIENCES. 



{>j>j>. Occipital process narrowed, its margins scarcely convex. 



grandicassis stricticassis 37b. 

 oo. Occipital process widest at its base. 



</. Interorbital region granular, or if smooth the fontanel with- 

 out a groove; posterior nasal openings not connected by a mem- 

 brane.* (NETUMA.) 

 r. Fontanel not produced backward as a groove. 



s. Maxillary barbels reaching to base of ventrals; head 4-4 

 in the length; eye 4-4f in the head, H-lf in interocular 

 space; body little broader than high; caudal compressed; 

 head depressed, acute, its width IJ-li in its length, width 

 of mouth 2-2|. Occipital process keeled, not much longer 

 than broad; snout scarcely longer than eye, depressed; a 

 large axillary pore; dorsal spine 1^ in head, granulated on 

 its basal half in front, striate on sides, slightly serrate be- 

 hind; adipose longer than dorsal fin, twice as long as high; 

 pectoral spine broader but not longer than dorsal spine, its 

 inner margin conspicuously serrated; ventrals much shorter 

 than pectorals; anal as high as long; caudal 4f-6 in the 

 length; D. I, 7; A. 18-20. t (Bleeker.) dubia 38. 



ss. Maxillary barbels reaching about to base of pectorals; 

 head 3}-3f in tne length; eye 8-10 in head, 4-5 in inter- 

 ocular width: head convex transversely, tapering forward. 



kessleri 39. 



rr. Fontanel continued backward as a groove; eye 6| in head, 

 3^ in the interocular space; maxillary barbels reaching middle 

 of pectorals; shields of head finely granular. No axillary 

 pore. insculptus 40. 



qq. Interorbital flat and smooth, or with smooth ridges, the fon- 

 tanel continued backward as a groove. 

 t. Vomerine patches of teeth united, except in young. 



u. Groove of fontanel almost obsolete, not reaching occipital 

 process; occipital process about as broad at base as long; 

 its margins concave; caudal a little shorter than head; 

 head 3 in the length; shields of head rather coarsely 

 granular. planiceps 41. 



uu. Groove of fontanel well defined, reaching occipital pro- 

 cess; occipital process longer than broad, its margins 

 straight; barbels short, compressed at base. 

 v. Inner margin of palatine patches of teeth straight; dis- 

 tance between them equals the diameter of pupil. Fon- 

 tanel abruptly continued as a groove. Granulations 

 fine, irregularly scattered. Anterior margin of dorsal 

 spine with sharp straight teeth. platypogon 42. 



*See //. 



t Based on specimens .131 and .171 m. long. 



