309 



Villiform teeth in a narrow, slightly arcuate band in the jaws, 

 those on the palate are more conical, in two widely separate, 

 small, oval patches, the long axes of which meet anteriorly in 

 an acute angle. 7 distant, very short gillrakers. Dark bluish 

 above, whitish below, fins whitish, dorsal and caudal with a 

 dark border. Length 330 mm. 



Nomen in dig. : Gutgut (Djambi). 



Habitat: Java; Sumatra (Palembang, Djambi!); Borneo 

 (Pamangkat, Sinkawang). Pinang, Malacca, Siam. 



In rivers and estuaries. 



25. Arius macronotacanthus Blkr. 



Arius macronotacanthus Bleeker, Nat. & Geneesk. Arch. Ned. Ill (2). 1846, 



p. 159. Verb. Bat. Gen. XXII. 1847, Silur. batav. p. 32. 

 Arius arius Cantor, Journ. Asiat. Soc. Bengal XVIII. 1850, p. 1240. (fide Giinther). 

 Cephalocassis macronotacanthus Bleeker, Ichth. Arch. Ind. Prodr. I. 1858, p. 106. 

 Arius macronotacanthus Bleeker, All. Ichth. II. 1862, p. 32. 

 Arius macronotacanthus Giinther, Cat. Brit. Mus. V. 1864, p. 169. 

 Arius macronotacanthus Volz, Zool. Jahrb. Abth. Syst. X!X. 1903, p. 389. 



B. 6; D. I. 7; A. 19; P. I. 9; V. 6. 



Height 4 ! / 2 4 3 / 4 ; head about ^\ v nearly as high as broad, 

 its greatest width about equal 

 to head without snout, its bony 

 shields finely granulated and ru- 

 gous. Occipital process with a 

 median keel, triangular, about 

 as long as broad, its sideborders 

 straight, its truncate hindborder 

 touching the narrow, semicircular 

 basal bone of the dorsal spine. The 

 narrow median fontanel begins 

 above the hindborder of the eyes 

 and reaches nearly to the occi- 

 pital crest. Dorsal profile with a 

 convexity at the occipital process, 

 very gently sloping down to 

 the rounded, slightly prominent 

 snout. Eye 5'/ 2 (in specimens of 

 230 mm.), with a free orbital 



3 . Anns macronotacanthus Blkr. X A>- 



margin, nearly twice in snout 



and less than thrice in the interorbital space. Maxillary barbels 



Fig. 



