29/7 
process, which is about 3 times longer than broad, with the 
borders nearly parallel, its truncate hindborder touching the 
broad, granular, somewhat horseshoe-shaped basal bone of the 
dorsal spine. Humeral process triangular, rather short. Dorsal 
profile sloping down in a straight line to the very broad, 
rounded snout, the gape of which is 1°/, the length of the head. 
Eye 11, with a free orbital margin, situated in the anterior '/, 
of the head, about 6 times in the flat interorbital space, 2'/, in 
snout. Barbels short, the length of the maxillary ones in our 
specimen (650 mm.) equal to the distance between the front- 
-border of snout and the hindborder of the eye; mandibulary ones 
about of equal length. Height of dorsal 1°/, in length of head, 
its spine 1°/, in same length, rugous in front,-dentated behind. 
Base of adipose fin nearly equal to 
that of the dorsal, nearly 4 times 
in its distance from that fin, above 
hinderhalf of anal, the free border 
of which is slightly cancave. Ven- 
trals touching the anal, shorter Fig. 121. Arius latirostris Macl. 
than the pectorals, about as long Teeth of upper jaw and palate, 
é about 1/y. 
as the dorsal; the pectoral spine 
equal to '/, length of head, rough in front, nearly smooth behind. 
Caudal deeply ,forked, lobes pointed. Villiform teeth in the 
upper jaw in a rather broad band, the two halves of which 
meet at an obtuse angle; the two mandibulary bands are 
curved, those on the palate in a broad, curved band, consisting 
of two median square patches, separated by a narrow inter- 
space, laterally contiguous with the lateral patches, which are 
much broader than long. 12 stiff, flattened, triangular gillrakers, 
about half as long as the eye. Dark brown above, white below, 
dorsal, adipose fin, anal and caudal darkish. Ventrals and 
pectorals yellowish. Pectorals with a dark spot on inner half 
of upper surface. Length about 650 mm. 
Habitat: South New Guinea (Goldie river, Lorentz river!). 
In fresh water. 
17. Arius stirlingi Ogilby. 
Arius stirlingi Douglas Ogilby, Proc. Linn. Soc. N. S. Wales, XXIII. 1898, 
pe 251. 
Nemapteryx stirlingt Douglas Ogilby, Ann. Queensl. Mus. N® 9, 1908, p. Io. 
Arius stirlingi Max Weber, Nova Guinea, IX. livr. 4. 1913, p. 540. 
