251 



B. 89; D. I. 7; A. 3. 3639; P. i. 9-10; V. 6. 



Height 4 J / 2 4 3 / 4 , head 5, eye less than 3, shorter than 

 snout, the distance of the eyes is dorsally more, ventrally 

 less than diameter of eye. Occipital process very narrow. 

 Maxillary barbels extending to the ventrals or on the anal, 

 those of the mandibles to the base of the pectorals. Dorsal 

 equal to head without snout, its spine, the hindborder of 



Fig. 101. Lais hexanema (Blkr.). 



which is denticulated, is slightly shorter. Pectorals equal to 

 head, their spine as long as the fin, -denticulated at its inner 

 border. Ventrals equal to eye, not reaching anal. Pearl- 

 colored, back darker, distal part of dorsal, caudal, pectorals 

 and ventrals blackish. Length 165 mm. 



No men in dig.: Lais (Sundan.). 



Habitat: Java (Batavia, Tjikao, Parongkalong); Sumatra 

 (Palembang, Lahat, Lematang Enim, Ringat !, Sidjundjung! 

 Djambi!); Borneo. -- Malacca. 



In freshwater. 



3. Helicophagus Blkr. 



(BLEEKER. Act. Soc. Sci. Indo-Neerl. Ill, 1858, p. 45). 



Elongate, compressed, head covered by skin, conical with 

 a pointed prominent snout; profile behind dorsal nearly straight, 

 before the dorsal sloping downwards, more or less keeled by 

 the occipital process and interspinal bone of the dorsal, which 

 are more or less visible through the skin. Mouth subterminal. 

 Anterior nostrils wide, surrounded by an elevated rim, situated 

 at the top of the snout; looking forward or upwards. Posterior 

 nostrils with an anterior lip, situated midway between anterior 

 nostrils and eye. Eye at some distance behind and above 

 the corner of the mouth, with a free orbital margin, more or 

 less prominent on the eye. Four barbels, the maxillaries 



