281 



its greater part in the first half of the head, with a free orbital 

 margin, more than 3 times in the interorbital space. Maxillary 

 barbels I */ 2 in head, relatively longer in small specimens, 

 mandibulary ones 2 ! / s in head, mental ones still shorter. Height 

 of dorsal at least as long as head without snout, its spine of 

 equal length, granulate in front, serrated behind. Base of 

 short adipose fin nearly half the length of that of the dorsal, 

 about 7 times in its distance from it, situated above anal, 

 which is not much longer than dorsal. Height of anal about 

 equal to the length of the ventrals, which don't reach the anal. 



Fig. no. Arius polystaphylodon Blkr. X Va- 



Fig. in. Arius poly - 

 tfaphylodon Blkr. Teeth of 

 upper jaw and palate '/! 



Pectorals equal to height of dorsal, their spine as long as or a 

 little longer than the dorsal one, flattened, with the frontborder 

 granular, the hindborder strongly serrated. Caudal deeply incised. 

 Villiform teeth in the jaws, those on the palate obtusely 

 conical in two small, oval, widely separate anterior patches; 

 far behind them two long, narrow, oval patches, strongly narr- 

 owing behind, with the long axis parallel. 9 short, stiff gill- 

 rakers, half as long as branchial filaments and shorter than 

 half eye. Greyish brown above, silvery below, fins dusky. 

 Length 340 mm. 



Habitat: Java (Batavia); Sumatra (Moara Kompeh); Singa- 

 pore; Celebes (Macassar!). 



In sea, estuaries and rivers. 



