BY J. DOUGLAS OGILBY. 33 



and slender. Eyes rather large, lateral, high. Gill-openings 

 rather wide, much wider than the isthmus; gill-membranes united, 

 attached to the isthmus along the median line, the free margin 

 interrupted ; six branchiostegals ; gill-rakers short, stout, com- 

 pressed, remiform, rather numerous. Axillary pore present. 

 Dorsal fin originating midway between the pectorals and ventrals; 

 adipose fin moderate, entirely above the anal. Occiput rounded; 

 nuchal crest rather feeble. Occipital fontanelle dilated and sub- 

 circular, much shorter than the interorbital; a large supraorbital 

 fontanelle; otic fonticle slit-like. 



Etymology : — V7]8vs, womb; a-Tofxa, mouth. 



Type : — Hemipimelodiis dnyi, Ramsay & Ogilby. 



Distribution : — Rivers of southern New Guinea. 



Pachyula, gen.nov. 



Head depressed anteriorly, wider than deep, the nuchal region 

 elevated. Mouth small and transverse, the upper jaw well pro- 

 jecting and somewhat gibbous anteriorly; lips thick, the upper 

 terminating in a broad free lobe. Jaws with bands of villiform 

 teeth, that of the premaxillaries wide and transversely divided 

 by a naked groove, behind which the teeth are smaller and 

 decumbent; mandibular band narrow; vomer and palatines tooth- 

 less. " Barbels six, two maxillary and four mental, the former 

 short and slender. Eyes very small, supero-lateral. Gill-openings 

 somewhat restricted, wider than the isthmus ; gill-membranes 

 united, attached to the isthmus along the median line, leaving a 

 narrow margin free; five branchiostegals; gill-rakers small, conical, 

 in moderate number. Axillary pore present. Dorsal fin origin- 

 ating much nearer to the pectorals than to the ventrals; adipose 

 fin rather long and low, originating well in advance of the anal. 

 Occiput feebl}' and obtusely ridged ; nuchal crest prominent. 

 Occipital fontanelle dilated and cordiform, shorter than the inter- 

 orbital ; a large supraorbital fontanelle ; otic fonticle replaced 

 by an angular sulcus. 



Etymology : — naxvs, thick; Zvka, gums. 



Type : — Hemipimelodus crass/'labris, Ramsay & Ogilby. 



Distribution : — Rivers of southern New Guinea. 



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