A COLLECTION OF FISHES FROM SUMATRA. 511 



extremity free from preorbital a short distance, and equal in width to three-fifths 

 of eye-diameter. Lips rather thick. Teeth in upper jaw biserial, conic, rather 

 large, numerous, outer series enlarged, and also much larger anteriorly. Teeth in 

 mandible uniserial, similar to those in upper jaw, and with a pair of canines on 

 each side in front. Vomer, palatines, and tongue with minute teeth. Tongue 

 rather broad, rounded and free in front. Nostrils two vertical slits, opposite middle 

 and close to front of eye. Preorbital broad, about equal to exposed portion of eye. 

 Interorbital space broad, elevated, and giving place to median trenchant keel which 

 begins over nostrils and runs to spinous dorsal. A supraocular keel running up on 

 upper side of head and another more posterior running toward shoulder not so 

 pronounced. 



Gill-opening broad, extending forward a little beyond front rim of orbit. 

 Rakers iv, 3 + 13, in, long, compressed, slender, attenuate, and longest about 

 two-thirds of orbit. Gill-filaments shorter. Pseudobranchias but little shorter than 

 filaments. Isthmus rather narrow, and with a rather broad groove. 



Scales small, more or less crowded anteriorly, and narrowly imbricated. Head, 

 with exception of opercle above, upper posterior side, and entire cheek, naked. 

 Scales on cheek, like those on breast, small. Narrow scaly sheath at base of 

 spinous dorsal. Soft dorsal and anal with rather low anterior basal scaly sheaths 

 made up of minute scales, and anterior rays of these fins also covered with minute 

 scales. Base of caudal with minute scales, and base of each lobe with a low keel. 

 Base of pectoral naked. Lateral line strongly arched anteriorly till about opposite 

 base of fourth dorsal ray. Scutes strong on sides of caudal peduncle, deepest a 

 little over nine in greatest deptli of body. 



Origin of spinous dorsal a little behind that of pectoral, spines slender, pungent, 

 third longest, and all depressable in a groove. Soft dorsal with anterior rays ele- 

 vated, forming a distinct lobe, last ray longer than those immediately preceding, 

 and origin of fin nearly midway between front of eye and base of caudal. Soft 

 anal similar, slightly convex, and origin a little nearer base of caudal than pos- 

 terior margin of eye. Anal spines depressable in a groove, first inserted about 

 opposite origin of. soft dorsal, and second longer. Abdomen keeled before anal 

 spines to anus. Pectoral long, falcate, and nearly reaching a third of straight part 

 of lateral line. Ventral small, inserted a little in advance of origin of pectoral, 

 and about reaching anus. Caudal deeply forked, lobes pointed. Anus well forward, 

 at tips of ventrals. 



Color in arrack grayish or slaty-gray above, sides and lower surface white, 

 washed with silvery. Outer portions of dorsals and upper lobe of caudal dusky, 

 other parts and remaining fins yellowish. A small grayish-black blotch on upper 

 edge of opercle. A blackish blotch on inner base of pectoral. Iris yellowish. 

 Peritoneum white. 



Length 8 inches. 



Type No. 27,512, A. N. S. P. Padang. 



Three examples, the type described above, and two young, the larger of which 



