528 A COLLECTION OF FISHES FROM SUMATRA. 



SPILOTICHTHYS subgen. nov. 

 Type Holocentrus radjabau Lacepdde. 



Dorsal spines 10. Scales small. 

 (STTtXojTos, stained or blotched ; l\dv<i, fish.) 



144. Plectorhinchus radjabau (Lac^pfede). 



Subgenus PLECTORHINCHUS (Lacepede). 



Dorsal with 11 to 13 spines. Scales small, about 80. 



145. Plectorhinchus sebae (Bleeker). 



146. PoMADASYS coMMERSONNii (Lac^pede). 



147. ScoLOPSis BLEEKERi Guiither. 



148. Odontonectes erythrogaster (Cuvier). 



149. C^sio C/Erulaureus Lac^pfede. 



150. C.ESio erythrochilurus sp. nov. Plate XIX, upper figure. 



Head 3; depth 2f ; D. X, 15; A. Ill, 11; P. ii, 17; V. I, 5 ; scales 52 in a 

 lateral series to base of caudal below lateral line ; 8 scales between origin of spinous 

 dorsal and lateral line, and. 15 between latter and origin of anal ; 52 scales in lateral 

 line to base of caudal ; width of head 2^ in its length, measured from tip of upper 

 jaw ; depth of head 1^ ; snout 4 ; eye 3| ; maxillary 3 ; interorbital space 3|- ; man- 

 dible 21 in head, measured from its own tip ; third dorsal sjaine 2^ ; first dorsal ray 

 2|-; third anal spine 3; first anal ray 2|-; least depth of caudal peduncle 3^; 

 ventral \\. 



Body elongate, compressed, more or less ellipsoid, back little if any elevated, 

 and profiles more or less evenly convex. Caudal peduncle compressed, and its least 

 depth about three-fourths its length. 



Head rhomboid, rather deep, compressed, and upper profile slightly concave 

 over front of eye. Snout short, somewhat broad, convex, and upper jaw but little 

 projecting. Eye moderate in size, orbicular, a little high, and its posterior margin 

 about midway in length of head. Mouth well inclined, and when closed mandible 

 protrudes a little beyond upper jaw. Maxillary reaching, a little beyond front rim 

 of orbit, and its distal expanded extremity two-fifths latter's diameter. Preorbital 

 narrow, its least width one-fourth of orbit. Teeth minute, several a little enlarged 

 and canine-like in front of upper jaw. Each ramus well elevated inside mouth. A 

 series of minute teeth on vomer and along each palatine. Tongue elongate, pointed, 

 and free in front. Nostrils close together, well separated from upper front rim of 

 orbit. Anterior nostril with a slight cutaneous rim. Interorbital space convexly 

 elevated. Margin of preopercle finely serrate, and suprascapula smooth along its 

 margin. An obsolete opercular spine, and a pointed opercular flap behind. 



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

 11 + 23, long, slender, and pointed, equal to longest filaments, which are half of 

 orbit. Pseudobranchise as large as gill-filaments. Isthmus narrow and convex. 



Scales moderately large, ctenoid, running in series parallel with lateral line 

 above its course, and in more or less horizontal longitudinal series below. Inter- 

 orbital sjjace, snout, narrow orbital border, preorbital, maxilliary and jaws naked, 

 head otherwise scaly. A patch of scales on top completely crossing over inter- 



