251 
Ree—o; D1 7; Avl3..36—39; PP. r o—T0; V. 6. 
Height 4'/,—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. 
Nomen indig.: 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. III, 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 
