No. 3.] . SPENCER — PALEOZOIC GEOLOGY. 169 



Astrceophi/llum gracile at Owen Sound. 



Caunopora annulata " " 



Syringopora retiformis " " 



Zaphrentis Roemeri " " 



Cyiitip)hyllum vesiculosum at Thorold, 



Petraia pygmxa " 



Diphyphyllum Ccespitosum " 



Clathopora fondona " 



" intermedia " 



Retepora aspcrato-striata " 



Trematopora osteolata at Niagara River. 



Fenestella tenuiceps " " 



Athyris intermedia " " 



Strophomena subplana at Thorold. 



Orthis biforata " 



In the catalogue above-named we find 84 species of Clinton 

 and 49 of Niagara fossils, collected by Messrs. Nicholson and 

 Hinde, of which the above 39 species have not been obtained by 

 me, or in so poorly preserved condition as to be rejected from my 

 cabinet. In the catalogue the names of fossils are not usually 

 placed in two formations, but only in that where they more 

 generally occur. 



In the catalogue of the fossils of the Medina, Clinton and 

 Niagara, given here, there will be found 121 species of Niagara 

 and 53 of Clinton and Medina, of which only a i^ivf species are 

 repeated in the lists. The principal omissions in my cabinet are 

 in the poorly preserved specimens of the Clinton, at Dundas, and 

 in the species found at Thorold and Owen Sound. Neither of 

 the lists includes 13 species of annelid jaws, recently described 

 by G. J. Hinde, Esq. 



APPENDIX A. 



Catalogue of Fossils of (lie Hudson Rlvrr Forma t ion ^ found in 

 the Old Beaches at the icesfern end of Lake Ontario. 



The study of the occurrence of these fossils belongs, strictly 

 speaking, to the Drift, which will be described in a subse- 

 quent paper. From the Palgeontological point of view, they 

 are more interesting in connection with this portion of the study 

 of the Geology of the Kegion about the Western End of Lake 

 Ontario than in that of the Surface Geology. 



The following is a list of the fossils which I liave obtained in 

 considerable quantities from the Ibssiliferous pebbles of both the 

 ancient and modern beaches in the region of Hamilton : 

 Vol. X. L 2 No. 3. 



