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 
', of head. Ventrals reach 
Fig. 128, Arius leptaspis (Blkr.) X 1/.. 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 
Late of upper J8W broader than long, contiguous with the 
GREAT HE di somewhat obliquely placed lateral ones, 
which are oval and twice broader than long. 12 flattened 
1) 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 l.c.). 
etx 
Dabdies 4% 
