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 1'/, in head, relatively longer in small specimens, 
mandibulary ones 2'/, 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. 111. Arius poly- 
staphylodon Blky. Teeth of 
Fig. 110. Arius polystaphylodon Blkr. X '/,. 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. 
