104 



Of these, No 5 is an addition to our list of Pleistocene shells from 

 the Ottawa district. 



Amongst the interesting specimens of Pleistocene fossils which 

 came under our notice of late, was a portion of the lower jaw of a 

 young seal found in a nodule of calcareous matter at Green's Creek. 

 This specimen was in the possession of Sir James Grant one of our 

 members. Sir James handed it to Dr. Ami, who had it photographed 

 and reproduced (see accompanying cut), so that our members may have 

 an opportunity of seeing it, and also for the purpose of placing it on 

 record. 



During his researches in the Ottawa and Gatineau districts, Dr. R. 

 W. Ells noted the occurrence of marine shells at two localities, viz: 



(1.) MacGregor's Lake, two miles north of Perkins's Mills, at an 

 elevation of 450 feet above sea-level. Saxicava rugosa, L., ( = 

 Saxicava pholadis) was found in great abundance with a remarkably 

 firm and thick test. 



(2 ) Near Cantley, P. Q., three species of Pleistocene and marine 

 shells : 



1. Macoma fragilis, Fab. 



2. Saxicava rugosa, L. 



3. Leda (Portlandia) arctica, Gray. 



HENRY M. AMI. \ 



R. W. ELLS. - Leaders. 



March 19th, 1894. W. F. FERRIER, ) 



RECENT DEPOSITS IN THE VALLEY OF THE OTTAWA 



RIVER. 



By R. W. Ells, LL. D., F. G. S. A., F. R. S. C. 



The question of the evolution and subsidence of the earth's crust is 

 one which in recent years is engaging much of the attention of leading 

 geologists both in Canada and the United States. Various opinions 

 have been expressed on the subject, some contending that the 

 submergence of the land can be measured by a very considerable 

 amount ranging from 1,000 to 2,000 feet or even more, while others 

 maintain that the change of level is very much less. Controversy on 

 this point at times waxes warm; for involved in the general question is that 



