534 PROCEEDINGS OP THE ACADEMY OF [DeC, 



rather large, jaws about even. Maxillary large, rather exposed, to 

 front eye margin, scarcely beyond. Premaxillaries protractile. Man- 

 dible rather broad, depressed, rami well elevated inside mouth. Lips 

 rather firm, little fleshy, rather narrow. No barbel. Jaw edges tough, 

 rather firm, though not especially trenchant. Tongue small, thick, 

 fleshy, not free in mouth. Nostrils large, together, superolateral on 

 snout to upper front pupil margin, posterior exposed in crescent, much 

 larger. Interorbital broad, flattened, scarcely elevated convexly over 

 eye. Preorbital elongate, greatest width about f its length, latter 

 If in horizontal eye. Other suborbitals all narrow. Posterior pre- 

 opercle margin straight, slightly inclined posteriorly. 



Gill-opening forward about opposite posterior preopercle margin. 

 Rakers iii, 2-1-2 short weak blunt stumps, much shorter than fila- 

 ments. Latter about half of horizontal eye. Pseud obranchiae large, 

 little shorter than filaments. Isthmus broad, level, least width about 

 H in horizontal eye. Teeth 1, 4-4, 1, rather conic, hooked, with 

 grinding surfaces. 



Scales large, cycloid, disposed in longitudinal series parallel with 

 1. 1., rather broadly exposed or coloration producing vertical rhombs, 

 each with many very minute obsolete radiating strise, of about vmiform 

 size, and a few small ones crowded on caudal base. Small rounded 

 adnate scaly flap in ventral axil, about 3- of fin. I^. 1. continuous, 

 little decurved anteriorly, and ascending behind dorsal midway along 

 caudal peduncle side. Tubes simple, each well exposed, or after first 

 5 extending all way to each scale edge. 



Dorsal origin midway between snout tip and caudal base, graduated 

 down from highest or first branched ray, depressed fin about | to caudal 

 base. Anal origin inserted just after dorsal base, graduated down 

 from first branched or longest ray, fin base If its depressed length. 

 Caudal long, deeply forked, lobes rather long, pointed, lower much 

 longer. Pectoral rounded, uppermost rays longest, fin about y^^^ to 

 ventral. Latter inserted trifle before dorsal origin, reaches anal. 

 Vent close to anal. 



Color in alcohol faded but little from that described below, when 

 fresh. 



Color when fresh rather clear dull olivaceous-brown above, margin 

 of each scale dusky till low as 1. 1. at least, and producing a network 

 of diamonds or rhombs in appearance. Head dusky-brown above, and 

 this forming into a median dusky dorsal line. Side of body more or 

 less silvered. Lower surface of head and body mostly translucent 

 whitish. Iris bright silvery, slightly dusky above. Jaws pale or trans- 



