504 PROCEEDINGS OF THE ACADEMY OF [Sept., 



first f of mandible length. Mandibular teeth strong, thick-rooted, 

 surfaces convex, edges entire, each with an enlarged median cusp, 

 and one or two smaller basal cusps on each side, all of which sharp 

 and triangular. Two small conic canines close inside outer sym- 

 physeal teeth. No other teeth in mouth. Buccal membranes well 

 developed, upper especially broad. Tongue thick, fleshy, rather 

 depressed above and scarcely free in front. Mandible strong and 

 rami little elevated in mouth. Nostrils rather large, close together, 

 anterior simple pore and posterior exposed in crescent, close before 

 upper front eye edge or about last fourth in snout. Interorbital 

 broadly convex. Preorbital quite narrow and maxillary slipping 

 below its lower edge. Antero-infraorbital broadly triangular, small. 

 Postero-infraorbital large, its length equals snout and half of eye. 

 Postorbital small, its width If in eye. Opercle width 2\ its depth. 

 Preopercular edge nearly vertical, but slightly inclined behind, and 

 its lower corner rounded. Bones of head all smooth, without striae. 

 Cutaneous edge of gill-opening moderately broad. 



Gill-opening extends forward about opposite hind pupil edge. 

 Rakers about 9 + 13, lanceolate, slender, pointed, a little less than 

 longest filaments. Filaments about 1^ in eye. No pseudobranchise. 

 Isthmus narrow, surface rather rounded, and membranes form 

 slight free fold anteriorly for short space. Branchiostegals 4, strong, 

 and subequal. 



Scales cycloid, all rather more or less narrowly imbricated, disposed 

 in series parallel with 1.1., and becoming but a trifle smaller along 

 edges of body and breast. Many as 6 radiating strire visible on 

 scale exposure and usually well marked. Caudal base covered with 

 scales but little smaller than those on rest of body. Slight pit, 

 formed by membrane above, in pectoral axilla. Axillary ventral 

 scaly flap pointed, slender, free, about 3 in fin. Anal base with low 

 sheath of thin small scales. Scales passing over all body edges. 

 L. 1. complete, begins sloping down from shoulder in even curve 

 till about opposite ventral origin, where near lowest third in body 

 depth, and then gradually slopes up, low along caudal peduncle 

 side at first to middle of caudal base. Tubes all simple, short and 

 but little exposed. 



Dorsal origin about midway between hind nostril and caudal 

 base, first branched and third simple ray longest and subequal, 

 depressed back far as tips of any others, fin If to adipose fin origin. 

 Adipose fin moderate, If in eye, origin about midway between 

 depressed dorsal tip and caudal base, fin 2 to latter. Caudal 



