762 PKOCEEDIXGS OF THE ACADEMY OF [Xov., 



short oblique groove from its lower angle. Teeth small, conic, sharp 

 and uniserial in jaws. Vomer with a patch of minute teeth. Palatines 

 with similar elongate and narrow patches. Tongue free, elongate, 

 thick, and broadly rounded in front. Anterior nostril nearer front 

 rim of pupil than tip of snout. Posterior a vertical slit a little less 

 than half of orbit and placed in last third of space between its front 

 rim and anterior nostril. Interorbital space and entire top of head 

 convex. 



Gill-opening deep, broad, and extending forward till opposite space 

 between nostrils. Rakers 5+16, compressed, pointed, and longest f 

 of orbit. Filaments numerous, long, and longest a trifle longer than 

 eye. Pseudobranchise about f of eye. Isthmus long, slender, and 

 with rounded edge. 



Scales minute, and cycloid, those forming small corselet greatly en- 

 larged anteriorly. Soft dorsal and anal, together with base and middle 

 of caudal, covered with minute elongate scales. Lateral line superior 

 and convex at first, then extending down on middle of side of caudal 

 peduncle to keel. Base of caudal with a low keel above and below. 

 A narrow scaly keel above upper pectoral ray running back for about f 

 length of fin. Scales on outside basal portions of ventrals enlarged. 

 Head naked, and cheek with long narrow horizontal l)undles of muscular 

 fibres. 



Spinous dorsal depressable in a groove, anterior spine longest, 

 enlarged, close to second, and others from third all shorter and further 

 apart. Insertion of spinous dorsal nearly midway between front 

 margin of eye and origin of soft dorsal, which falls well in front of that 

 of anal, or midway between front rim of orbit and base of caudal. 

 Finlets similar, evenly distributed, and with a long point behind. 

 Caudal broad, lunate, strong, and lobes narrow. Pectoral long, and 

 reaching origin of anal. Ventral small, strong, inserted a little behind 

 origin of pectoral and fitting in a depression on belly. 



Color when fresh in arrack faded probal^ly. Back and upper surface 

 apparently faded steel-gray. Side grayish with round whitish spots 

 on side of abdomen. Lower surface silvery- white. Dorsal and caudal 

 dusky-brown. Upper finlets grayish, lower whitish with a gray blotch. 

 Anal grayish. Pectoral blackish-gray, ^'entrals white with gray 

 membranes. Keel on caudal peduncle blackish. Peritoneum pale. 



Length 17^ inches. 



One example from Padang, Sumatra. Coll. A. C. Harrison, Jr., and 

 Dr. H. M. HiUer. 



This form has never been compared with the Atlantic fish, in view of 



