62 



NEW GENERA AND SPECIES OF AUSTRALIAN 



FISHES. 



By J. Douglas Ogilby. 



In the present paper two new genera are characterised, namely, 

 Monnthrix for a Brotulid allied to Dinematichthys but differing 

 in the dentition, the uniradial ventrals, tfec, and Austrophycis for 

 a Gadid, closely allied to Physicidus and Silota, with the latter 

 of which it agrees in the forward position of the anal fin, but differs 

 in the dentition and other particulars. Full diagnoses are given 

 of the clupeid genera Hi/perlophits and Potamolosa, in fulfilment of 

 a promise made at last October's meeting. Ten species of fishes 

 are described as new, namely, Septranchias Jiasivelli, SprateU- 

 oides rohustus, Koivala casfelnaui, Ili/perlophus copil, JSIuyil 

 hypselosoma., M. qeoryii^ Cesfrcsus norfolcensis, Odax attenuatus, 

 Mo)iothrix polylepis, Austrophycis meyalops, and Otophidium 

 genyopus. Opportunity has also been taken to make some further 

 remarks on Psendomuyil siynifer and Dermatopsis macrodon. 



While examining the specimens of the notidanoid sharks con- 

 tained in the collections of the Australian and University 

 Museums, I came upon the curious jaws of which I give a 

 description below : — 



Heptranohias haswelli, sp.nov. 



Upper jaw. — Median tooth well developed, subulate, bent 

 backwards but with a distinct curve towards the left, and without 

 basal cusps; it is followed by three similar teeth and flanked by 

 a pair of similar and but slightly larger teeth, which are directed 

 outwards and backwards, and are provided with an inconspicuous 

 cusp on either side of the base ; these two together with the 

 anterior tooth of the median series are inserted in advance of the 

 functional row, which are on the same level with the second tooth 

 of the median series; behind each of the lateral pair are three 

 teeth which increase in size posteriorly, the last two being 



