44 CALli'ORNIA ACADEMY OF SCIENCES. 



/. Eye 9 iu the interorbital; dorsal plate emargiuate be- 

 hind, as wide as the cranium behind eye; granulations 

 not extending forward to eyes; opercle and humeral pro- 

 cess striate, not graniilar; dorsal and pectoral spines 

 graniilar, moderately serrate. Upper jaw little longer; 

 palatine bands of teeth oval. Maxillary barbel extend- 

 ing to middle of pectoral. Ventral shorter than pectoral 

 fins; adipose one-third less than anal fin. Upper caudal 

 lobe little the longer. D. I. 7; A. IS.'' (Cuv. & Val.) 



Jlavescens 25. 

 a. Eye 6-7 in the interorbital; dorsal plate half as wide as 

 the skull behind the eye, i^ointed in front, entering the 

 broad, short occipital process; surface of the bones 

 striate rather than granulate. Maxillary barbels reach- 

 ing tips of ventrals. D. I, 6; A. 21. t (Cut. & Val.) 



temminckianiis 26. 

 hh. Eye 5^ or less in the interocular space. 

 _/. Maxillary barbels reaching middle or end of dorsal fin. 

 Dorsal plate as wide as long, its surface pitted. Gran\i- 

 lations of the head extending to above middle of cheeks. 

 An elongate patch of teeth behind each palatine jDatch. 

 Upper caudal lobe 3| in the length. Head 3^. 



emj^hysetufi 27. 

 jj. Maxillary barbels not reaching bey.ond base of pectoral. 

 Dorsal plate longer than wide, its siirface granular. 

 Granulations of the head extending to above the ej^e. 

 No pterygoid teeth. Upper caudal lobe 5 in the length. 

 Head 3t. brandti 28. 



(jij. Dorsal plate notched iu front, receiving the point of occi- 

 pital process. 



k. Eye midway between snout and preoj^ercle; occij^ital pro- 

 cess twice as long as broad, its tip mucronate, correspond- 

 ing to a notch in the dorsal plate; top of head granulated 

 to front of eyes; opercle granulated superiorly; humeral 

 process as long as high, strongly granulated. Ventrals as 

 long as pectorals. Maxillary barbels not reaching beyond 

 middle of pectorals? D. I, 7; A. 18. t (Cuv. & Val.) 



77iesops 29. 

 kk. Eye nearer snoi;t than to preoi^ercle. 



I. Jaws subequal; occipital process broader than long, 

 mucronate at tip; dorsal plate large, butterfiy-shaijed; 

 opercle striate. Eye IJ in snout. proopH 30. 



*Based on a specimen .81 m. long. 

 tBased on a specimen .20 m. long. 

 IBased on a specimen .43 m. long. 



