320 
length. Height of anal nearly equal to head without snout, 
ventrals somewhat shorter, not reaching on anal. Pectorals 
about equal to dorsal, their spine of equal length, longer than 
dorsal spine, anteriorly with blunt, posteriorly with long, 
pointed teeth. Caudal deeply forked, the pointed lobes thrice 
as long as the median rays. Least height of caudal peduncle 
nearly thrice in its length. In each oval maxillary patch 
nearly 10 conical teeth, the mandibulary patches are smaller and 
triangular and have about an equal number of teeth. All teeth 
are depressible. 8 stiff, flattened gillrakers, considerably shorter 
than the branchial filaments. Dark bluish, underside of head 
and belly whitish with a silvery hue, increasing on sides and 
tail. Fins dark brown. Length of single specimen 210 mm. 
Habitat: South New Guinea (Lorentz river!). 
4. Nedystoma Ogilby. 
(I. Doucias OciLby, Proc. Linn. Soc. N.S. Wales, 1898, p. 32). 
Head scarcely depressed but little wider than deep. Mouth 
moderate, transverse, upper jaw projecting. Nostrils close 
together, no nasal barbel. Maxillary, mandibulary and mental 
barbels slender and short. Median fontanel ending dilated and 
rounded midway in the rounded occipital shield, which is not 
covered by skin. Occipital process touching the basal bone of 
the dorsal spine. Eyes rather large, only anteriorly with a 
free orbital margin. Dorsal with 7 rays and a pungent spine, 
originating midway between pectorals and ventrals. Adipose 
fin rather small, above the anal. Pectorals with a pungent 
spine. Ventrals with 6 rays. Caudal deeply forked. Axillary 
pore present. Jaws with one or two series of feeble, somewhat 
deciduous teeth. Palate edentulous. Gillmembranes united, 
attached to the isthmus along the median line and confluent 
with its skin, without forming a free margin. On the lower 
branch of the first branchial arch numerous (23) long, cylin- 
drical gillrakers, internally from them a series of more than 30 
low, triangular processes. 6 branchiostegals. 
1. Nedystoma dayi (Ramsay & Ogilby). 
Hemipimelodus Dayi Ramsay & Ogilby, Proc. Linn. Soc. N. S. Wales (2). I 
1886, p. 16. 
Nedystoma Dayi 1. Douglas Ogilby, Proc. Linn. Soc. N. S. Wales 1898, p. 33. 
Nedystoma Dayi Max Weber, Nova Guinea IX. livr. 4. 1913, p. 548. 
