322 
to head. Base of adipose fin somewhat shorter than dorsal, it 
goes in small specimens more than twice, in larger nearly thrice 
in its distance from dorsal. Height of concave anal equal to 
head without snout or somewhat less. Ventrals reaching the 
anal, equalling in length the height of lastnamed. Pectorals 
as long as head without snout or longer, osseous part of their 
spine slightly shorter but much longer than dorsal spine, 
flattened .and serrated at its hindborder only. Caudal deeply 
incised, the pointed lobes nearly 3 times longer than median 
rays. Least part of caudal peduncle about twice in its length. 
The very minute teeth form in the jaws a narrow, slightly 
curved band of one or two rows. Lower part of first branchial 
arch with 23 cylindrical, stiff gillrakers, broadened at their 
base, the longest equalling the branchial filaments; mesially 
on the same arch is a parallel row of more than 30 low, 
triangular processes with a swollen top. Colour silvery, above 
dark blue, crown yellowish brown, fins hyaline, more or less 
darkish at their margin. Length about 240 mm. 
Habitat: South New Guinea (Strickland river, Lorentz 
river !). 
5. Hemipimelodus Bleeker. 
(BLEEKER, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 236). 
Head more or less depressed. Mouth transverse, moderate 
or small, snout prominent or even projecting and gibbous. 
Nostrils close together, no nasal barbel. Maxillary, mandibulary 
and mental barbels slender, rather long. Headshields visible 
or more or less covered by skin. Occipital process touching 
the basal bone of the dorsal spine. Eyes with or without a 
free orbital margin. Dorsal with 7 rays and a pungent spine, 
originating midway between ventrals and pectorals or nearer 
to lastnamed. Adipose fin of moderate length or short, origin- 
ating above or slightly before the anal. Pectorals with a pungent 
spine. Ventrals with 6 rays. Caudal deeply forked. Axillary 
pore present. Jaws with a band of villiform teeth. Palate 
edentulous. Gillmembranes united, attached to the isthmus 
along the median line, leaving a narrow margin free. On the 
lower branch of the first branchial arch a moderate number 
of short, more or less conical gillrakers. 5—6 branchiostegals. 
