304 



Dorsal profile sloping down with a slight concavity on the 

 occiput to the broad, rounded, flattened snout. Eye in the 

 anterior half of the head, with a free orbital margin, about 6 

 (in specimen of 345 mm.); about 4 times in the slightly 

 convex interorbital space. Humeral process a long, narrow 

 triangle, sharply pointed, rugous. Maxillary barbels extending 



to middle of pectorals, man- 

 dibulary barbels not quite so 

 far, mental ones to the hind- 

 border of the gillmembrane. 

 Height of dorsal equal to 

 head without snout, its 

 strong spine equal to post- 

 orbital part ! ), anteriorly 

 rugous, posteriorly serrated. 

 Base of adipose fin some- 

 what shorter than that of 

 dorsal, nearly 4 times in 

 its distance from that fin, 

 situated above middle of 

 anal, the free border of 

 which is concave and the 

 height of which is nearly 

 ! / 2 of head. Ventrals reach 

 Fig. 128. Arius leptaspis (Blkr.) x V-2- anal, much shorter than 



pectorals, which are as long 



as head without snout, their strong flattened spine is anteriorly 

 scarcely, posteriorly strongly serrated, as long as head without 

 snout ! ). Caudal deeply forked, lobes pointed, the upper one 

 the longer. Villiform teeth in the jaws 

 in an arcuate band; on the palate in 4 

 distant patches, forming a rather broad, 

 arcuate band, the two median ones oval, 

 Fig. 129. Arius leptaspis separated by a narrow interspace, half 



(Blkr.). Teeth of upper jaw broader than long, contiguous with the 

 and palate '/i- 



somewhat obliquely placed lateral ones, 

 which are oval and twice broader than long. 12 flattened 



i) This is the case in specimens above 325 mm. In specimens of 295 mm. 

 and less, we find the dorsal spine equal to the head without snout and the 

 pectoral spine equal to head from posterior nostril, (cf. M. Weber I.e.). 



