312 Proceedings of the Royal Physical Society. 



of whicli I hope to place these Australasian Strophalosicc on a 

 more satisfactory basis. 



If a Productus, it evidently comes very close to the Per- 

 mian P. horridus. The less perfect state of preservation of 

 the Australian shells does not permit an opinion to be passed 

 on the lateral wings ; but so far as the mesial sinus of the 

 ventral valve is concerned, it is decidedly less in the latter 

 than in typical examples of P. horridtis (figs. 50 and 51). 

 Internally, however, the two forms very closely resemble 

 one another. There are the same strongly developed cardinal 

 muscular impressions in the ventral valve, similar prominent 

 overhanging beak, and long septum in the ventral valve ; in- 

 deed, the whole habit strongly reminds us of the well-marked 

 Permian form alluded to. 



Loc. — Tasmania. (Strzelecki and Jukes Collections, Brit. 

 Museum.) 



4. Stratigeaphical jSTotes on the preceding Species. 



Having in previous pages given a description of the fossils, 

 it now only remains to be seen how far the grouping of the 

 species in localities will assist in the consideration of the stra- 

 tigraphy of the districts collected from. 



A. Devonian. 



1. Fanning Paver. — A limestone at this locality has yielded 

 to Mr Jack's researches a small parcel of fossils, which appear 

 to have a strong Devonian facies. They are — two species of 

 Spirifer, one close to S. curvata (Schlotheim), and another 

 after the S. glabra type ; two species of Atrypa, A. reticularis 

 (Linn.), and A. desquamata (Sow.), or at any rate a shell so 

 close to the latter that it is difficult to make a separation be- 

 tween them ; and lastly, Orthotetes crenistria. 



2. Fanning Old Station. — The shale above the Fanning 

 Limestone has yielded, at this locality, the Atrypa desquamata 

 and several specimens of a Rhynchonella, which are as simi- 

 larly near to B. pirimipilaris (Von Buch) as the large Atrypa 

 is to Sowerby's species. 



Looking upon the fossils from the Fanning Eiver Limestone 



