286 



broad at its base, much less than twice longer than broad at 

 its posterior end, which is obtusely emarginate and touches 

 the small granular basal bone of the dorsal spine. A long 

 median lanceolate fontanel nearly reaching to the base of the 

 occipital process. Eye 4*/ 2 to more than 5, superior, with a 

 free orbital margin, totally or nearly totally situated in the 

 anterior half of the head, 2 2 ] / 3 in the interorbital space, 

 smaller than the convex, scarcely prominent snout. Humeral 

 process of moderate strength, acute, rugosely reticulated. 

 Axillary porus present. Maxillary barbels extending somewhat 

 beyond the head, the intermaxillary ones not so far, the mental 

 ones are still shorter. Dorsal acute, higher than the body, 

 twice higher than long, its strong spine of same length or a 

 little shorter, scarcely shorter than head, serrated along both 

 edges. Adipose fin nearly as long as dorsal, removed 3 times 

 its length from the dorsal, less than twice longer than high, 

 obliquely convex. Anal acute, emarginate, much lower than 

 body, about as long as high, much less than twice the length 

 of the adipose fin. Pectorals scarcely shorter than the head, 

 their strong spine somewhat shorter than the dorsal one, its 

 hindborder conspicuously dentated, its frontborder weakly so. 

 Ventrals about i 1 ^ times in length of head. Caudal deeply 

 incised. The superior of the acute lobes is the longer. Small, 

 acute teeth in the upper jaw in a slightly curved, broad 

 band, 3 times as long as broad, its length nearly equal to 

 that of the eye ; in the lower jaw in a subsemilunar band 

 not much longer than eye. Teeth on the palate rather large, 

 molarlike, forming two separate, subovate patches, much 

 longer than eye. Bluish green above, margaritaceous or silvery 

 below. Fins yellowish, more or less dusky. Adipose fin with 

 a large black spot. Length 213 mm. [After Bleeker and 

 Gunther, not seen by us]. 



Nomen indig. : Lundu (Serawak). 



Habitat: Borneo (Banjermassin, Sarawak). 



In rivers. 



9. Arius thalassinus (Riipp.) [Fig. 106, p. 273]. 



Bagrus thalassinus Ruppell, Neue Wirbeltiere, Fische 1835 1840, p. 75. 

 Arius nasutus Cuvier & Valenciennes, Hist. Nat. Poissons XV. 1840, p. 60. 

 Bagrus rhodonotus Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2), 1846, p. 157. 

 Bagrus carchariorhynchos Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2), 

 1846, p. 291. 



