2/5 



/3. base of adipose fin shorter than that 



of dorsal, more than 2 times in its 



distance from that fin. 



at. teeth on palate in a continuous 



row of square patches without 



median interspace A. latirostris p. 296. 



/3'. teeth on palate in a row of 4 

 patches, the median ones being 

 separated by an interspace at least 

 half their length. 

 a 1 . Dorsal spine much longer than 

 that of P. and as long as head 



from nostrils A. stirlingi p. 297. 



b*. Dorsal spine equal to or shorter 

 than that of P. and at most as 

 long as head without snout. 

 a 2 , adipose fin about 5 times in 

 its distance from dorsal, op- 

 posite to hinderhalf of anal A. danielsi p. 300. 

 /A adipose fin 2 1 /. 2 ~4 times, in its 

 distance from dorsal, above 

 anterior half or middle of 

 anal. 



a 3 , occipital process with the 

 sideborders slightly conver- 

 ging, nearly parallel. 9 gill- 

 rakers A. acrocephalus p. 302. 



b*. occipital process triangular, 

 with the sideborders con- 

 spicuously converging. 12 



gillrakers A. leptaspis p. 303. 



C. Teeth in one group on each side. 



1. median fontanel on upper surface of head 

 posteriorly broad, heart-shaped, with a 

 smaller ovate one on each side. Hind- 

 border of dorsal spine with the dentation 



partly directed upward. (Cephalocassis Blkr.) A. melanochir p. 305. 



2. median fontanel not broadened posteriorly. 

 (Arius Blkr.). 



a. teeth on palate in a pearshaped patch 

 with the points directed backwards, the 



long axes converging backwards A. I eptonot acanthus p. 306. 



b. teeth on palate in ovate patches, the 



