THE 



CANADIAN RECORD 



OF SCIENCE. 



VOL. IV. 



APRIL, 1891. 



NO. 6. 



Descriptions of Four New Species of Fossils 



From the Silurian Rocks of The South 



Eastern Portion of the District 



of Saskatchewan. 1 



By J. F. Whitbavks. 



(With Plate III.) 



While engaged in explorations on behalf of the Geological 

 Survey of Canada in 1889 and 1890, Mr. J. B. Tyrrell dis- 

 covered an area of Silurian (Upper Silurian) rocks on the 

 north east side of Lake Winnipegosis, on Cedar Lake, and on 

 the Saskatchewan Eiver below Cedar Lake. From these 

 rocks an interesting series of fossils was obtained, some of 

 which are apparently new to science, and of these latter, 

 four of the most characteristic or important species will bo 

 described and illustrated in the present paper. On strati- 

 graphical and other grounds, Mr. Tyrrell has found it de- 

 sirable to divide the Silurian of this district into two local 

 subdivisions. The fossils here described will be considered 

 in the order of their geological relations, but it may be well 

 to state that the Pentamerus and Gomphoceras are from the 



1 Communicated by permission of the Pirector of the Geological Survey of 

 Canada. 



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