306 
the palate, which are shorter than the eye. 9 stiff, somewhat 
flattened gillrakers, shorter than branchial filaments and slightly 
longer than half eye. Darkish brown above, white below. Fins 
yellowish, blackish in the middle, adipose fin without black 
spot. Length about 300 mm. 
Habitat: Sumatra (Palembang, Djambi!); Borneo (river 
Kapuas). 
In rivers. 
22. Arius leptonotacanthus Blkr. 
Arius leptonotacanthus Bleeker, Verh. Bat. Gen. XXII. 1849, Bijdr. Ichth. 
Madura, p. II. 
Cephalocassis leptonotacanthus Bleeker, Ichth. Arch. Ind. Prodr. J, Siluri, 1858, p. 105. 
Arius leptonotacanthus Bleeker, Atl. Ichth. II. 1862, p. 32. 
B: 650 Di. 7s ARG 20 ey. Swe NESS 
Elongate. Height about 4°?/,. Head 3, broader than high, 
its greatest width being contained 1°/, in its length. Head 
scattered with very small granulations. The long, broad median 
fontanel reaches to base of occipital process, which is trian- 
gular, shorter than broad at its base, elevated along the 
middle, its broad truncated or emarginated hindborder reaching 
the small, smooth basal bone of the dorsal spine. Eye lateral, 
about 5°/,, with a free orbital margin, about three times in 
the interorbital space, situated in the posterior part of the 
anterior half of the head, not twice as long as the depressed, 
convex snout. Humeral process of moderate length, rugous. 
Axillary pore present. Maxillary barbels extending to base of 
pectorals, mandibulary ones to branchial opening, the mental 
ones shorter. Dorsal scarcely as high as body, twice higher 
than long, its rather slender spine 1!/, times in head, with 
the hindborder with strong spines, directed downward, the 
top of its frontborder slightly serrated. Adipose fin much 
shorter than base of dorsal, its base more than 3 times in 
its distance from lastnamed. Anal rounded anteriorly, slightly 
emarginated, about twice longer than adipose fin, much longer 
than high. Pectorals nearly 1'/, times in head, their spine 
stronger than the dorsal one, but slightly shorter, strongly 
denticulated behind, the top of its frontborder serrated. Ventrals 
acutely rounded, shorter than pectorals. Caudal deeply incised, 
with acute lobes. Small, sharp teeth in curved bands in the 
jaws. The teeth on the palate are villiform, and form two 
