368 



Habitat: Sumatra (Telok Betong, Palembang, Djambi!, 

 Gunung Sahilan !, Lower Langkat, Deli); Borneo (Bandjer- 

 niassin [river Barito], Sintang [river Kapuas]). — Siam (Bleeker), 

 Malay Peninsula. 



2. Fam. LUCIOCEPHALIDAE. 



Elongate, subcylindrical, posteriorly somewhat compressed. 

 Head not much shorter than trunk. Snout produced. Upper 

 jaw much shorter than projecting mandible, bordered by inter- 

 maxillaries, which are strongly protractile and composed of 

 an inner or anterior horizontal part and an outer or posterior 

 part which is provided with an ample membranaceous fold 

 and bent upward along snout when mouth is closed. When 

 mouth is opened both parts are protruded so that the upper 

 jaw is the longer and the gape rather wide. Jaws with small, 

 conical, fixed teeth; vomer anteriorly rough by minute teeth. 

 A short dorsal opposite to posterior half of anal. Anal with 

 a deep notch, beginning at some distance behind vent. Caudal 

 rounded. Pectorals short, rounded ; below their base the ventrals 

 with a weak spine and five rays, the first of which has at its 

 outside a long articulated filament. Scales cycloid on head, 

 ctenoid on trunk, moderate, regularly arranged, lateral line 

 indicated on some scales by shallow impressions or abortive 

 tubular lateral organs. Opercular bones entire, scaly, as also 

 the large praeorbital, the rounded border of which is finely 

 serrated. Gillopenings very wide, reaching to below eye, the 

 naked gillmembranes not being united. Five branchiostegals. 

 No pseudobranchiae. Four complete gills. No air-bladder. 

 Suprabranchial organ well developed '). 



I. Luciocephalus Bleeker. 



(Bleeker, Nat. Tijdschr. Ned. Indie, I. 1851, p. 274). 



Diplopterus Gray, Illustr. of Indian Zoology I. 1830- — 1832, tab. 87, fig. I 



(figure only, no description; name preoccupied). 



For characters of the single genus see those of the family. 

 Distribution: that of the single species known. 



i) First described by Bleeker (Nat. Tijdschr. Ned. Inditi XX. 1859 — 1860, p. 395). 



