291 



12. Arius stormi (Blkr.). 



Cephalocassis Stormii Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 246. 

 Hemiarius Stormi Bleeker, All. Ichth. II. 1862, p. 29. 

 Arius stormii Giinther, Cat. Brit. Mus. V. 1864, p. 162. 



B. 6; D. I. 7; A. 16; P. I. II; V. 6. 



Elongate; height below dorsal spine 5 ! / 2 , head about 3 ! / 2> 

 depressed, broader than high, its width about i J / 3 in its length. 

 Headshields granular. Occipital process triangular, longer than 

 broad, carinated, in old specimens mesially elevated, its side- 

 borders straight or slightly concave, its truncate hindborder 

 reaching the narrow crescentic 

 basal bone of dorsal spine. 

 Median fontanel somewhat tri- 

 angular, its top ending at some 

 distance of the occipital pro- 

 cess; 2 rounded fontanels above 

 the opercle. Dorsal profile slo- 

 ping down in a nearly straight 

 line to the somewhat pointed, 

 strongly projecting snout. Eye 

 8 10, with a free orbital mar- 

 gin, about 3 times in the inter- 

 orbital space and 3 times or 

 more in the snout. Humeral 

 process very narrow, origi- 

 nating from a broad base, its 

 upper border concave. Maxill- 

 ary barbels extend to the opercle, the mandibulary ones nearly 

 to the hindborder of the gillmembrane, mental ones shorter. Soft 

 dorsal equal to head from nostril, its very strong spine of 

 equal length, granulated in front, serrated at both sides, the 

 teeth looking upwards. Base of adipose fin longer than that 

 of the dorsal, not yet twice in its distance from lastnamed, 

 as long as the anal, the free margin of which is concave. 

 Ventrals far distant from anal, shorter than pectorals, which 

 are equal to head from middle of the eye, their strong flattened 

 spine is shorter than the dorsal one, granulated in front, 

 strongly serrated behind. Caudal deeply forked. Sharp teeth 

 in an arcuate row in the jaws; those on the palate in four 

 patches: two small median oval patches separated from each 



