286 ON GLACIAL SHELL-BEDS IN BEITISH COLUMBIA. 



Discussion. 



The Peesident said that probably some geologists would find it 

 difficult to accept the Author's explanation of the presence of the 

 shells in the Eoulder-clay. 



Mr. Clement Eeid remarked on the great clearness of the paper, 

 and bore testimony to the close analogy between these deposits and 

 those of Holderness. A new point in the paper was the similarity 

 of the glacial faunas of Vancouver Island and Holderness, whilst 

 the present faunas of the Atlantic and Pacific are so different, show- 

 ing that an Arctic fauna had been driven southwards into both 

 oceans. He quite corroborated the Author's views as to decalcifica- 

 tion, but declined to discuss the question of the origin of the Boulder- 

 clay. 



Dr. Hinde commented on the undoubted fact of the former exist- 

 ence of glaciers in this district ; but whether the transportation of 

 the shelly clays took place at their second advance after a mild 

 interval, the evidence seemed hardly sufficient to determine. 



Prof. EoNNEY was sensible of the value of the paper, but thought 

 that the Bridlington beds differed from those described in being 

 portions of masses transported in a frozen condition. He thought 

 it impossible that the shells would have escaped destruction on the 

 Author's theory. He instanced the case of the neighbourhood of 

 Montreal, where a true Boulder-clay overlying ice-worn Trenton 

 Limestone may be traced into a sandy deposit crowded with 

 Saccicava, &c. 



Prof. Seeley had found shells in the Boulder-clay of Norfolk and 

 Cambridgeshire, all of which, when not broken, were abnormally 

 thick. 



Mr. Robert Bell remarked on the fact that nearly all the speci- 

 mens were bivalves, and a large number of them in pairs. 



The Peesident regretted the absence of Mr. Bauerman, who was 

 personally acquainted with the locality described in the paper. 



i 



