355 



caudal. Adipose fin and caudal bordered by the same colour. 

 Pectorals, ventrals and anal hyaline, lastnamed with a trans- 

 verse series of black spots. Dorsal hyaline, sometimes with a 

 black submarginal band. Length about 120 mm. [Type in 

 Leyden Museum seen by us]. 



Habitat: Borneo (Mahakam river!). 



3. Leiocassis stenomus (C. V.). 



Bagrus stenomus Cuvier & Valenciennes, Hist. Nat. Poissons, XIV. 1839^.415. 

 Leiocassis Ellenriederi Bleeker, Act. Soc. Sc. Indo-Neerl. VIII. 1860, Negende 



Bijdrage Sumatra, p. 10. 



Leiocassis stenomus Bleeker, Atl. Ichth. II. 1862, p. 54. 

 Liocassis stenomus Giinther, Cat. Brit. Mus. V. 1864, p. 90. 

 Liocassis stenoimis Vaillant, Nouv. Arch. Mus. Hist. Nat. (3) V. 1893, p. 73. 

 Liocassis stenomus Popta, Notes Leyden Museum, XXVII. 1906, p. 51. 



B. 9; D. I. 7; A. 1517; P- I- 7; V. 6. 



Dorsal profile nearly straight from snout to dorsal. Height 

 4 2 / 3 to nearly 6. Head 4 4 2 / 3 , broader than high, covered 

 by skin. Occipital process triangular, short, about as long as 

 broad at its base, reaching or nearly reaching the triangular 

 basal bone of dorsal spine. Eye 4 6, nearly twice in the 

 rounded, prominent snout, which is about equal to interorbital 

 space. Nasal barbels reaching beyond eye or even to hind- 

 border of operculum, maxillary and mandibulary ones extending 

 to end of pectorals or of humeral process, mental ones to 

 humeral process or not so far. Height of dorsal equal to 

 head without snout or a little more, its spine equal to or 

 more than postorbital part of head, with the hindborder weakly 

 serrated. Base of adipose fin longer than that of dorsal, the 

 distance between both is about equal to i ! / 2 times the length 

 of the adipose fin. Origin of anal slightly before that of the 

 adipose fin. Origin of ventrals, which are far distant from the 

 anal, behind the end of the base of the dosal. Pectoral spine 

 slightly shorter than the head, with strong denticulations 

 along its hindborder. Caudal deeply forked, with the lobes 

 produced into filaments. Height of caudal peduncle nearly 

 iV 2 times in its own length. Teeth in jaws and on palate in 

 curved bands. Darkish brown above, lighter below, with lighter 

 cross-bands. A narrow one on occiput, a broader one before 

 adipose fin and a narrow one at caudal peduncle. Dorsal with 

 a black intramarginal band. Adipose fin darkish with a light 



