3 20 



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. DOUGLAS OGILBY, 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. 



i. Nedystoma dayi (Ramsay & Ogilby). 



Hemipimelodus Dayi Ramsay & Ogilby, Proc. Linn. Soc. N. S. Wales (2). 1 



1886, p. 16. 



Nedystoma Dayi I. Douglas Ogilby, Proc. Linn. Soc. N. S. Wales 1898, p. 33. 

 Nedystoma Dayi Max Weber, Nova Guinea IX. livr. 4. 1913, p. 548. 



