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NOTES ON THE FOSSILS 



OP THE 



CLINTON, NIAGARA AND GUELPH FORMATIONS 

 OF ONTARIO, 



WITH DESCRIPTIONS OF NEW SPECIES. 



BY H. ALLEJTNE NICHOLSON, M.D., D.So., F.R.S.K,, 

 Professor of Natural History in University College, Toronto, 



AND 



GEORGE JENNINGS HINDE, Esq. 



Li the present communication we propose to note the different 

 species of fossils which we have met with in our examination of the 

 Clinton, Niagara and Guelph formations, as displayed in Western 

 Ontario. Many of the localities in which these formations occur, 

 have, as a matter of course, not been visited by us, and our lists are 

 therefore necessarily imperfect, and are to be regarded as merely a 

 preliminary contribution to a more complete and extended enumera- 

 tion. Not a few indeed of the forms previously recorded from these 

 formations by the Geological Survey of Canada have escaped our 

 notice. On the other hand, we have a considerable number of species 

 which have not until now been recognized as occurring in Canada, 

 whilst we have a few which appear to be altogether new, and which 

 we shall, therefore, describe in detail. 



I.— FOSSILS OF THE CLINTON FORMATION. 



1. Buthotrephis gracilis. Hall. {Ref. Buthotrephis gracilis, 

 Hall, Pal. N.Y. Vol. II., pi. v. and v. bis). Specimens, in all essen- 

 tial respects identical with the obscure fossils figured by Hall under 

 this name, are far from uncommon in the Clinton Group. They are 

 chiefly referable to the forms described under the titles of var. inter- 

 media and var crassa, and present themselves as branching flexuous 

 bodies, sometimes in the form of hollow moulds or casts, at other 

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