424 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Body compressed, elongated, back a little elevated, or more convex 

 than lower profile, and greatest depth falling at origin of spinous dorsal. 

 Edges of body rounded. Chest flattened. Least depth of caudal 

 peduncle 1| in its length. 



Head compressed, sides flattened so that its width is equally wide 

 above and below. Profile similarly inclined, and nearly straight. 

 Muzzle prominent, robust. Snout as long as broad and with convex 

 surface. Eye rather large, circular, touching upper profile and falling 

 about first f in length of head. Mouth moderately large, inclined a 

 little, and with gape straight. Mandible broad, depressed on lower 

 surface, rami elevated posteriorly inside mouth, symphysis with slightly 

 elevated dentigerous process and protruding well in front of snout. 

 Lips rather thin and fleshy. Maxillary reaching middle of orbit, its 

 upper edge slipping below preorbital to its extremity, and distal ex- 

 pansion equals diameter of pupil. Bands of villiform teeth in jaws, 

 on vomer and palatines. Tongue smooth, free and rounded in front. 

 Nostrils adjoining, close to front rim of eye, and posterior a little 

 larger. Along lower edge of preorbital 10 backwardly directed den- 

 ticles. Along ridge of preopercle at angle 2 denticles. Margin of 

 preoperele finely serrated, with about 6 especially enlarged serrae at 

 angle. Edge of suprascapula with graduated denticles to last or 

 posterior, which is largest. Interorbital space flat with 2 equidistant 

 parallel frontal ridges, convergent anteriorly at snout. Parietal ridge, 

 beginning as supraocular, also prominent and becoming somewhat 

 convergent towards occiput. A ridge on preorbital. Opercle ending 

 in a rather broad cutaneous flap posteriorly above. 



Gill-opening extending forward opposite front rim of orbit. Gill- 

 rakers II, 5 + 10, IV, lanceolate, slender, longest much longer than 

 filaments, or f of orbit. Gill-filaments about equal pupil. Pseudo- 

 branchise smaller than filaments. Isthmus narrow and with slightly 

 convex surface. 



Scales finely ctenoid, in even longitudinal series parallel with lateral 

 line, and those on middle of side largest. Scales small on predorsal 

 region, also those on or at bases of fins. About 12 series of scales on 

 cheek. Head naked, except cheek, postocular region, opercle, sub- 

 opercle, parietal region and occiput, though scales on opercle much 

 largest. A narrow basal scaly sheath extending till behind seventh 

 dorsal spine. Base of rayed dorsal covered with small scales, also of 

 anal and caudal. Axil of pectoral with a pit, a cutaneous membrane 

 covering it above. Ventral with a pointed scaly flap in axil about 

 I length of spine. Lateral line conspicuous, of simple large tubes, 



