2 7 6 



long axes of which converge more or 



less anteriorly. 



a. patches implanted upon a movable 



cushion J ) A. froggatti p. 307. 



|3. patches not movable. 



a' . long axes of patches, which are 

 slightly longer than broad, meet 



anteriorly in an acute angle . . . A. truncatus p. 308. 

 /3'. ovate patches twice as long as 

 broad, their long axes meeting 



anteriorly in a very blunt angle . A. macronotacanthus p. 309. 

 c. teeth on palate in more or less triangular 

 patches, the base of which is directed 

 anteriorly. 

 K. headshields granular, pectoral spine 



shorter than that of the dorsal . . . A. coelatus p. 310. 

 |3. headshields smooth or nearly so, 

 pectoral spine as long as that of the 

 dorsal. 



a', head 3 ! / 4 3^2, dorsal spine shor- 

 ter than head without snout, eye 



about 5 A. utik p. 312. 



|3'. head 3^3, dorsal spine longer than 



head without snout, eye 8 9. . A. doriae p. 313. 

 y'. head about 4, dorsal spine equal 



to head from nostril, eye 4-4V-2 ^- venosus p. 314. 



i. Arius crossocheilus Blkr. 



Arius crossocheilos Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 137. 

 Arius tonggol Bleeker, Nat. & Geneesk. Arch. Ned. Ind. Ill (2). 1846, p. 292. 

 Ariodes tonggol Bleeker, Ichth. Arch. Ind. Prod. I Siluri, 1858, p. 83. Atl. 



Ichth. II. 1862, p. 39. 

 Arius tonggol Giinther, Cat. Brit. Mus. V. 1864, p. 164. 



B. 6; D. I. 7; A. 18; P. I. II; V. 6. 



Elongate, height about 5, head 3'/ 2 , much broader than 

 high, its width about 2 / 3 of its length. Headshields with radiat- 

 ing roughened or granulated lines. The granulated occipital 

 process is triangular, somewhat longer than broad at its base, 

 elevated mesially and less than twice as long as broad in its 

 middle, its sides convex, the narrow hindborder touches the 

 granulated narrow basal bone of the dorsal, which has wing- 



i) according to J. Douglas Ogilby. 



