508 A COLLECTION OF FISHES FROM SUMATRA. 



about 13 scales between spinous dorsal and upper part of later-al line, and nearly 

 48 between latter point obliquely and origin of spinous anal ; width of head 2 in 

 its length; depth of head l^t' mandible 2-| ; fourth dorsal spine 2|-; first dorsal 

 ray 21; first anal ray 2^; least depth of caudal peduncle 5^; ventral 2|-; snout 4 

 in head, from its tip ; eye 3-| ; maxillary 3i ; interorbital space 3|- ; upper caudal 

 lobe 2-|- in body ; pectoral o^. 



Body elongate, ellipsoid, compressed, upper and lower profiles nearly evenly 

 convex. Greatest depth at origin of soft dorsal. Caudal peduncle long, its least 

 depth one and a third in its exposed length, and its width one and a half 



Head rather small, compressed, and obtuse in front. Snout short, convex 

 above, and blunt in front. Eje large, well anterior, and adipose eyelid broad, 

 nearly covering posterior half of eye. Mouth inclined, rather small, and with 

 upper jaw projecting beyond snout. Teeth fine, crowded, and in a single series 

 along edges of jaws. No vomerine or palatine teeth. Lips rather thin. Tongue 

 rather long, rounded, and free in front. Mandible slightly projecting. Maxillary 

 narrow, reaching below front margin of eye, and its distal expanded extremity 

 about three and one-half in eye. Nostrils small, adjoining, lateral, and nearer 

 front of eye than tip of snout. Interorbital space broad, elevated, and with a tren- 

 chant keel beginning in front and extending to origin of dorsal. 



Gill-opening large, running forwai'd a little in front of nostrils. Gill-rakers 

 7 + 21, compressed, pointed, and longest equal half of eye. Filaments a little 

 longer than longest rakers. Pseudobranchite small. Isthmus broad and with a 

 groove. 



Scales small, cycloid, and imbricated. Breast densely scaled. Head, except 

 infraorbital region, opercle, and upper posterior side, naked. Lateral line abruptly 

 arched at first till at least a little over straight portion which begins opposite 

 origin of soft dorsal. Scutes small, deepest about nine in greatest depth of body. 



Origin of spinous dorsal about over first fourth of ^^ectoral, sj^ines weak, 

 depressable in a groove, and fourth longest. Origin of soft dorsal nearly midway 

 between tip of snout and base of caudal, anterior rays elevated but not forming a 

 lobe. Anal spines small, first inserted a little before soft dorsal, about equal in 

 size, and depressable in a groove. Origin of soft anal a little nearer base of caudal 

 than tip of snout, or a little behind that of soft dorsal, fin similar. Caudal 

 deeply forked, lobes long and pointed, and upper longer. Pectoral long, falcate, 

 reaching halfway to base of last anal ray. Ventral small, inserted below origin of 

 pectoral, reaching a little more than halfway to origin of spinous anal. Anus well 

 before anal at tip of ventrals. 



Color in arrack slaty-gray above, lower sides and under surface silvery-white. 

 A large grayish blotch on opercle. Snout and upper surface of head somewhat 

 tinted with brown. Dorsals and caudal gray, spinous dorsal and inner margins of 

 caudal dusky. Soft dorsal and anal with a grayish longitudinal band, median on 

 first rays, and then submarginal. Pectoral pale grayish. Ventral whitish. Peri- 

 toneum silvery. 



