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, Verb. Bat. Gen. XXIT. 1849, Bijdr. Ichth. 



Madura, p. n. 



Cephalocassis leptonotacanthus Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 105. 

 Arius leptonotacanthus Bleeker, Atl. Ichth. II. 1862, p. 32. 



B. 6; D. I. 7; A. 2021; P. I. II; V. 5. 



Elongate. Height about 4 2 / 5 . Head 3, broader than high, 

 its greatest width being contained i 2 / 5 m i ts 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 2 / 3 , 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 i'/ 2 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 i'/ 2 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 



