260 



their spine of equal length, flattened, its hindborder serrated. 

 Villiform teeth in the jaws in curved bands, on the vomer 

 in 2 quadrangular patches, separated from the oblong palatine 

 patches. Silvery; upper surface of head and back blackish, as also 

 a band beginning at the opercle and running along the anterior 

 third of the lateral line, rapidly diminishing in size, some- 

 times continued as a narrow line to the base of caudal. Fins 

 yellowish, hindborder of caudal dark. Length about 180 mm. 



N o m e n i n d i g. : Rios. 



Habitat: Java ?, Borneo (Banj ermassin !). 



In rivers. 



6. Pangasius de Zwaani M. Web. & de Bfrt. [Fig. 103, p. 255]. 



Pangasius de Zwaani Max Weber & de Beaufort, in Maass, Durch Zentral- 

 Sumatra II. 1912, Fische p. 14. 



B. 9 ; D. II. 7; A. 34 ; P. I. I 3 ; V. 6. 



Elongate, compressed, dorsal profile straight behind dorsal, 

 before dorsal sloping down in a straight line to the broad, 

 slightly prominent snout. Mouthopening subterminal, some- 

 what oblique, curved, distance of corners of mouth slightly 

 more than twice in length of head. Height nearly 5, head '6, 

 covered by smooth skin. Eye slightly more than 4, shorter 

 than snout, situated behind corner of mouth, its lower half 

 below the horizontal through that corner, totally below the 

 horizontal through the extremity of the mouth, more than 

 thrice in the convexity of the interorbital space, more than 

 twice distant from each other ventrally. Maxillary barbels, 

 originating in a groove beginning behind corner of mouth and 

 hidden in its continuation nearly to the hindborder of the 

 eye, slightly longer than eye, the still weaker mandibulary 

 barbels 2 / 3 of eye. Dorsal equal to head, osseous part of 

 its spine somewhat shorter, its hindborder serrated. Adipose 

 fin shorter than eye, below posterior } J 3 of anal, which goes 

 3'/ 3 in length. Ventrals extending on anal, nearly as long as 

 head without snout. Pectorals equal to head, their spine 

 slightly shorter, with the hindborder denticulated. Villiform 

 teeth in rather narrow bands in the jaws, that of the upper 

 jaw slightly, that of the lower jaw strongly curved. Vomerine 

 and palatine teeth in 4 approximated patches, arranged in a 

 flat curve. Whitish, head, anterior part of body and back 



