312 THE CANADIAN NATURALIST. [Aug. 



PROCEEDINGS. 



ON THE FOSSILS OF THE TRENTON LIMESTONE OF THE 



ISLAND OF MONTREAL. 



By J. F. Whiteaves, F.G.S., &c. 



This paper is offered partly as a compilation of the results 

 obtained by other observers, and is partly derived from original 

 investigation. It is thought desirable to place upon record all 

 that is known with any degree of certainty respecting the fossils 

 of the Trenton limestone proper — exclusive of the Black River 

 Group — so far as these rocks have been explored on the island of 

 Montreal. The zone and locality that I have examined with 

 most care is the upper part of the formation, as it occurs between 

 the villages of St. Jean Baptiste and St. Michel. In this district 

 fourteen species have occurred to me, which, so far as I am aware, 

 have not yet been recorded as occurring on the island, two of 

 which (Atrypa deflecta Hall, and HoJopoea symmetrica Hall), 

 have not previously been detected in Canada. In addition to this, 

 I have obtained one Cystidean (?) new to science, two new bryozoa 

 (one the type of a new genus), a new brachiopod (of the Oi'bicula 

 group), and a new species of Otenodonta. The list of fossils, 

 however, must be looked upon only as a result of the commence- 

 ment of an investigation which has yet to be carried out. To my 

 friend, Mr. Billings, the Palaeontologist of the Geological Sur- 

 vey of Canada, I am indebted for much valuable assistance in the 

 determination of critical species. With the exception of Stroplw- 

 mena deltoidea, these fossils may perhaps be considered charac- 

 teristic of the upper zone of the formation. 



List of Fossils procured from the Trenton limestone proper, of 

 the island of Montreal : 



ZOOPHITA. 



Stenopora fibrosa, Goldfuss. 



" petropolitana, Pander. 



CRINOIDiE. 



Dendrocrinus acutidactylus, Billings. 



" proboscidiatus, " 



" cylindncus. " 



Heterocrinus Canadensis, " 



11 tenuis, " 



Rhodocrinus pyriformis, " (columns only). 



Cleiocrinus grandis, " 



CYSTIDEOS. 



Pleurocystites squamosus, Billings. 

 " exornatus, " 



