310 PROCEEDINGS OF THE ACADEMY OF [June, 



of adipose fin to lateral line; width of head 1| in its length; depth of 

 head 1^; snout 3f ; eye 3f ; width of mouth 2|-; interorbital space 2^0 ; 

 third dorsal ray 1|^; third anal ray 2; length of pectoral If; of ventral 

 1^; least depth of caudal peduncle 2h. 



Body deep, compressed, rhomboid in shape, and suggesting certain 

 Cyprinidce. Upper profile more or less evenly convex, back elevated, 

 and greatest depth at origin of dorsal. Lower profile at first straight 

 for a good distance, and becoming convex posteriorly. Caudal 

 peduncle compressed, short, and its least depth about equals its length. 



Head small, compressed or restricted a little below, and upper surface 

 broadly rounded. Lower surface of head also flattened. Snout 

 broad, obtuse, fleshy, and produced well beyond tip of mandible. Eye 

 circular, a trifle anterior, and above center in depth of head. Eyelid 

 narrow. Mouth broad, and in profile of gape curved downwards. 

 When opened mouth is broad, directed inferiorly, and jaws furnished 

 with broad thick and fleshy lips formed somewhat as a disk. Margin 

 of this disk with a single series of small weak or movable ciliiform 

 teeth. In front of each jaw behind outer series a short second or inner 

 series of similar ones, convex or angular in its course, and with bend or 

 angle directed inwards. Aperture of mouth small. Tongue small, 

 hardly free from floor of mouth. Nostrils close together on side of 

 snout above, and much nearer upper front rim of orbit than tip of 

 upper jaw. Anterior nostril circular, with its posterior cutaneous 

 margin more or less concealing posterior which is thus lunate. Inter- 

 orbital space broad and convex. Infraorbital rim narrow, lowest or 

 most posterior largest. Preorbital a little swollen, with a deep cavity 

 and large thick lip and maxillary more or less filling it when mouth is 

 closed. Opercle striate. Opercular flap broad and rather cutaneous. 



Gill-opening extending forward till nearly opposite posterior margin 

 of orbit. Rakers none. Filaments of inner series a little longer than 

 those in outer, or about equal to f of orbital diameter. Isthmus 

 broad. Branchiostegals long, broad, subequal, and 4 on each arch. 



Scales large, of more or less even size, disposed in longitudinal series 

 parallel with lateral line, and each one with several strise. Margin of 

 each scale also a little rough. Small scales on bases of caudal and anal, 

 otherwise fins and head naked. A pointed scaly flap in axil of ven- 

 tral equal to about ^ of length of ventral. Both predorsal and post- 

 dorsal regions with a median keel, former most distinct, and latter also 

 extending on upper surface of caudal peduncle behind adipose fin 

 though still less distinct. Behind first dorsal also an indistinct lateral 

 keel on each side, and below and posterior to adipose fin they are also 



