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!'/, to more than 5, superior, with a 
free orbital margin, totally or nearly totally situated in the 
anterior half of the head, 2—2'/, 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 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 
Giinther, not seen by us]. 
Nomen indig.: Lundu (Serawak). 
Habitat: Borneo (Banjermassin, Sarawak). 
In rivers. 
g. Arius thalassinus (Riipp.) [Fig. 106, p. 273]. 
Bagrus thalassinus Riippell, 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. III (2), 1846, p. 157. 
Bagrus carchariorhynchos Bleeker, Nat. & Geneesk. Arch. Ned. Ind. II (2), 
1846, p. 291. 
