253 
Eye 5—7, situated in the second '/, of the length of the 
head. Height of dorsal slightly less than head, its strong 
flattened spine slightly shorter, its hindborder denticulated. 
Adipose fin shorter than snout, situated above the beginning 
of the last '/, of the anal, its height less than snout. Anal more 
than thrice in length. The outer longer rays of the anal nearly 
equal to postorbital part of head. Pectorals about as long as 
head without snout, their strong flattened spine somewhat 
shorter, their inner border denticulated. Three groups of 3—4 
rather wide mucous pores in the axil of the pectorals. Cylin- 
drical teeth with brown tips forming a broad curved band in 
the jaws, those of the vomer in two distant narrow curved 
bands. Pearlcolored, upper surface dark. Fins reddish, dorsal 
and margin of caudal dark. A whitish spot on the top of the 
head. Length over 460 mm. 
Nomen indig.: Paten (Palembang). 
Habitat: Sumatra (Palembang!). 
In rivers. 
2. Helicophagus waandersi Blkr. |Fig. 102 p. 252]. 
Flelicophagus Waandersii Bleeker, Ichth. Arch. Ind. Prodr, I Siluri 1858, p. 175. 
Atle Tehths Wi. 1862, p: 7:7: 
Helicophagus Waandersi Giinther, Cat. Brit. Mus. V. 1864, p. 65. 
B. 9; D. I. 6—7; A. 37—38; P. 1. 1o—11; V. 6. 
Elongate, compressed, head conical, profile behind dorsal 
nearly straight, sloping down before dorsal in a straight line 
to the conical snout. Height 4'/,—5, head a little more or 
less than 5. Mouth subterminal, snout soft, prominent, behind 
its frontborder pierced through by the wide anterior nostrils 
which look upwards and are surrounded by a prominent rim; 
posterior nostrils more distant from each other, situated midway 
between anterior nostrils and eye, with a valve at the front- 
margin. Above the corner of the mouth a maxillary barbel 
extending on the pectoral; mandibulary barbels, originating 
close together at some distance behind the symphysis, some- 
what shorter. Eyes more than 4, situated at the end of the 
first half of the head, somewhat shorter than snout. Height 
of dorsal about equal to head without snout, its spine some- 
what shorter, very strong, flattened, the hindborder strongly 
denticulated; adipose fin above the last '/, of the anal, its 
height nearly equal to snout; anal 2%/, in length. Ventrals 
