2098 
Dil We 7 heh 2 3 ib. aadOg ew eto. 
Elongate. Height below dorsal spine 4°/,—5, head 37/,, 
width of head 1°/,, in its length, its dorsal profile sloping 
down in a straight line to the rounded, flattened, prominent 
snout which goes more than 2'/, times in head. Upper jaw 
projecting in such a way, that the larger part of the band of its 
teeth is not covered by the lower jaw. Mouth slightly rounded, 
nearly equal to postorbital part of head. Lips thickened where 
they meet. Headshield posteriorly striped and roughly but 
scarcely granulated; occipital process keeled, granulated, about 
twice as long as broad in its middle, 
its borders slightly concave and con- 
verging, hindborder deeply emargi- 
nate, touching the narrow crescentic 
basal bone of dorsal spine. Median 
fontanel shallow but broad, anteriorly 
bordered by two parallel ridges, poste- 
riorly by two converging ridges, which 
Fig. 122. Arius stirlingi Ogilby. About nat. size. 
are continued at their meeting point in the median crest of 
the occipital process. Humeral process a short but sharply 
pointed, smooth triangle. Eye 7*/,—8'/;, with the orbital margin 
quite incompletetely free, slightly directed upwards, about 
thrice in the slightly concave interorbital space, which goes 
2'/,—2*/, in head. Maxillary barbels extending on to ven- 
trals or at- least to end of pectorals, mandibulary barbels 
to middle of pectorals, mental barbels to posterior border of 
