203 



vexity. Maxillary barbel reaching to the anterior ! / 3 of anal 

 or farther, mandibulary barbel about as long as diameter of 

 eye. Height of dorsal equal to head without snout. Distance 

 from dorsal to snout about i 3 / 4 in its distance from the 

 caudal. Anal free from caudal, which is deeply incised. Ven- 

 trals below or a little in advance of origin of dorsal, about 

 half as long as pectorals, the length of which equals the 

 distance from the base of the maxillary barbel to hindborder 

 of operculum. The stiff portion of their spine is rather strong 

 and a little shorter than the postorbital part of the head. 

 Broad bands of fine, pointed, depressible teeth in the jaws. 

 Similar teeth on the vomer in two oblique oval patches. 9 very 

 short, stiff gillrakers, the longest with a basal prong. Black 

 brown, with lighter marmorations, belly and underside of head 

 whitish in small specimens, which have more or less blackish 

 fins. Length about 450 mm. 



Nomen in dig. : Tapa Rawang (Djambi). 



Habitat: Sumatra (Djambi!); Borneo (rivers Kapuas!, 

 Mahakam, Baram). 



In rivers. 



4. Belodontichthys Bleeker. 



(BLEEKER. Ichth. Arch. Ind. Prodr. I. Siluri, 1858. p. 266). 



Compressed, especially the long tail. Short, compressed head, 

 covered with skin, with prominent lower jaw. Its upper 

 profile concave, the neck elevated. Anterior nostrils long 

 tubes, the posterior nostrils, at some distance behind them, are 

 short tubes; both are between frontborder of snout and eye. 

 Eye above the angle of the mouth, covered by the skin. 

 A long maxillary barbel between the anterior nostril and 

 the corner of the mouth. A pair of very short mandibulary 

 barbels far behind the chin. Dorsal rudimentary, without 

 spine. No adipose fin. Anal very long, terminates close to the 

 caudal, which is forked. Ventrals below the dorsal, small, 

 composed of 9 10 rays. Pectorals very large, with a slender, 

 smooth spine. The widely set, slender, more or less arrowed 

 teeth of unequal size are in three series in the jaws, none 

 on the palatines, those of the vomcr in a single transverse 

 series and very small. Gillmembranes separated, free from 

 the isthmus. 



