THE 



CANADIAN NATURALIST 



AND 



^uuvtcvly fouvuiU of Science. 



THE POST-PLIOCENE GEOLOGY OF CANADA. 



By J. W. Dawson, LL.D., F.R.S., F.G.S. 



SUB-KINGDOM MOLLUSCA. 



Introductory . — In preparing this, the largest and most impor- 

 tant part of my catalogue, I have to acknowledge my obligations 

 to Dr. P. P. Carpenter, for his kind aid in comparing all the 

 more critical species of shells, and in giving me his valuable 

 judgment as to their relations and synonymy, which I have in 

 nearly every case accepted as final. I am also indebted to Dr. 

 Carpenter for all the notices of West-coast shells. 



To Mr. J. F. Whiteaves, F.G.S., I am indebted for reviewing the 

 Polyzoa and comparing them with Smitt's Norwegian catalogues, 

 and also for many valuable facts as to shells obtained in his recent 

 dredgings in the Gulf of St. Lawrence. 



To Mr. J. Gwyn Jeffreys, F.R.S., and Mr. R.McAndrew, F.K.S., 

 of London, my grateful acknowledgments are due for aid and 

 information, and also for the opportunity of comparing my speci- 

 mens with those in their collections. 



My comparisons with recent species have been made to a great 

 extent with specimens dredged by myself, in the Gulf of St. 

 Lawrence, and especially at Murray Bay, where the marine 

 fauna seems to be more nearly related to that of tlie Post-pliocene 



Vol. VI. Q No. 4, 



