318 Proceedings of the Royal Physical Society. 



Eiver Series insensibly leads us to the questions, What claim 

 have these deposits to be considered as of Permian age ? or 

 as containing a mixed Carboniferous and Permian fauna ? 

 To answer these questions we must go a little deeper into the 

 subject, and pass in review the other species occurring in 

 them. In the first place as to Stenopora. The recent researches 

 of Professor H. A. Mcholson and myself show this genus to be 

 a sound one, and not identical either with Chcetetes or Monticu- 

 lipora, as has been so stated by numerous authors. Further, the 

 genus is, we believe, characteristically a Permian one, although 

 it may be represented in carboniferous and lower rocks to some 

 small extent, in other words, the long array of species of the 

 latter age which have been tacked on to Stenoporct from time 

 to time, will, in all probability, be found wanting in its most 

 characteristic features. Typical Stenoporce have been described 

 by Lonsdale from the Permian rocks of Eussia,* and from 

 Geinitz's description, his S. Macivthif would appear to be 

 another, although in his later work on the " Dyas," the species 

 is merged in Stenopora columnaris (Schlotheim). 



With regard to the Polyzoa. Although Protoretepora is a 

 form which may very well find an analogue in true carboni- 

 ferous rocks, it may nevertheless be more strictly likened to 

 the Permian genus Phyllopora (King), rather than to the 

 Fenestella or Polypora forms met with in the lower horizon. 



So far therefore as the fauna found at two points on Peli- 

 can Creek (localities 1 and 4) and on Parrot Creek (locality 

 6) are concerned, I do not see how we can come to any other 

 conclusion, than tliat very strong evidence exists of the 

 marked Permian character of the fossils. 



At the 3d, 5th, and 7th localities, we meet with an assem- 

 blage of forms, which, omitting one or two dubious ones, have 

 usually been looked upon in New South Wales as of Carboni- 

 ferous age, and are there undoubtedly associated with others, 

 especially Brachiopoda, of a marked Carboniferous facies. 



Unfortunately I am not in possession of any information 

 as to the stratigraphical relation of the beds at the above 

 localities, one with the other, except in the broad sense of 



* Murchison's "Geol. Russia," 1845, i,, p, 632, 

 t Veostein deut-liecli Steinze, p. 17. 



