Section IV., 1909. [203] Trans. R. S. C. 



XIV. — On the Fossil Faunas of the St. Helen's Breccias. 

 By Henry S. Williams. 



May 1908. Ithaca, ^.Y., U.S.A. 



(Presented by Dr. F. D. Adams, read in abstract May 26, 1909.) 



CONTENTS 



The St. Helen's IsLind Limestone 205 



Review of Evidence 208 



Study of the material 210 



Lists of Species 210 



The Spirifer arenosus fauna 210 



The Gypidula pseudogaleata fauna 211 



Fauna of lot 3 (252.3) 212 



List of species from loose block of Cote St. Paul 212 



Discussion of the Faunas and their stratigraphie significance. . . 213 



Critical Study of the Species 214 



The Spirifer aienosus fauna 215 



The Spirifer montrealensis, sp. nov. described and illustra- 

 ted by plates I and II 222 



The Gypidula pseudogaleata fauna 226 



Fauna of lot 252.3 233 



Note on specimens from St. Helen's Island in McGill College 



Collection 234 



Fossils from Cote St. Paul 236 



Spirifer pennatus var. Helense, var. nov. and plates III and 



IV 236 



Conclusions 241 



The St. Helen s Island Limestone. 



The fauna, of the brecciated limestone area on St. Helen's Island, 

 opposite Montreal, Quebec, Canada, has been knowTi and its species 

 listed for a number of years. 



Lists of the species have been published as follows, viz. : 

 Logan-Billings. Geology of Canada, 1863, p. 356 (called ''upper 

 Pentamexus." 



