THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE III. VOL. VII. 



No. V.— MAY, 1890. 



OZR-IG-Hrsr-A-Ij ARTICLES. 

 I. — Notes on the Palaeontology of Western Australia. 



{Continued from the April Number, p. 155.) 



1. Stromatoporoidea. By Prof. H. A. Nicholson, M.D., F.G.S. 



2. Corals and Polyzoa. By George J. Hinde, Ph.D., F.G.S. 



[PLATES VIII. and VIII.a] 

 1. Stromatoporoidea. By Prof. H. A. Nicholson, M.D., F.G.S. 



Aotinostroma clathratum, Nich. Plate VIII. Figs. 8a, 8b. 



Actinostroma clathratum, Nich., Ann. Nat. Hist. ser. 5, vol. xvii. p. 226, pi. vi. 

 figs. 1-3; and Mouogr. Brit. Strom. Pal. Soc. p. 131, pi. i. figs. 8-13, and 

 pi. xii. figs. 1-5, 1889. 



The specimen here figured is a typical example of Actinostroma 

 clathratum. In all its general characters, and particularly in the 

 regular development of the radial pillars and the presence of 

 small astrorhizEe, it resembles the specimens from the Middle 

 Devonian of Germany, which may be regarded as the normal form 

 of the species. Very similar examples, however, occur in the 

 Devonian Limestones of Devonshire. The surface of the specimen 

 is not shown, being concealed beneath a crust of Stromatoporella 

 Eifeliensis. 



Locality. — Devonian, Eough Range, " opposite Mt. Krauss." 



Stromatoporella Eifeliensis, Nich. Plate VIII. Figs, la — 7c. 



Stromatoporella Eifeliensis, Nich., Ann. Nat. Hist. ser. 5, vol. xvii. p. 235, pi. viii. 

 figs. 5-7. 



The specimen here figured (Figs, la, lb) is a small example of 

 the common Stromatoporella Eifeliensis, Nich., of the Middle Devonian 

 rocks of Germany ; and Fig. 1c gives a good general idea of the 

 aspect of a vertical polished section as viewed under a lens. A 

 crust of the same species covers the surface of the specimen of 

 Actinostroma clathratum previously described, and of this three 

 sections have been prepared. The structure of these agrees, in all 

 essential respects, with that of sections of typical examples of 

 S. Eifeliensis from Gerolstein, and need not therefore be described 

 in detail. It is a remarkable and highly interesting fact that 

 the Devonian deposits of Western Australia should have yielded 

 examples of two such characteristic European Stromatoporoids as 

 Actinostroma clathratum and Stromatoporella Eifeliensis. 



Locality.— Hough. Range, "opposite Mt. Krauss." 



DECADE III. — VOL. VII. NO. v. 13 



