184 THE CANADIAN NATURALIST. [Vol. 



VI. 



ment. On the third terrace I observed a few large Laurentiau 

 boulders, and some pieces of red and gray shale of the Quebec 

 group, indicating the action of coast-ice when this terrace was 

 cut. On the highest terrace there were also a few boulders; and 

 both terraces are capped with pebbly sand and well rounded gravel, 

 indic'itino- the lono;-continued action of the waves at the levels 

 which they represent. 



Murray Bay, &c. — At Murray Bay, Petit Mai Bay, and Les 

 Eboulements, as noticed above, the system of Post-pliocene ter- 

 races is well developed. On the West side of Murray Bay, the 

 Silurian rocks of White Point, immediately within the pier, form 

 a steep cliff, in the middle of which is a terraced step marking an 

 ancient sea level. At the end nearest the pier the sea has again 

 cut back to the old cliff, leaving merely a narrow shelf; but toward 

 the inner side this shelf rapidly expands into the sandy flat along 

 which the main road runs, and which is continuous with the lower 

 plain extending all the way to the head of the bay. In this flat 

 the upper portion of the Post-pliocene deposit seems to consist 

 principally of sand and gravel, resting on stony clay. In the 

 former, which corresponds to the Saxicava sand of Montreal, I 

 found only a few valves of Tellica G7'oenlandica which is still 

 the most abundant shell on the modern beach. In the latter, 

 corresponding to the Leda clay, which is best seen in some parts 

 of the shore at low tide, I found a number of deep water shells 

 of the following species, all of which, except Spirorbis spirillum 

 and Aphrodite Grcenlandica , have been found in these deposits 

 at Quebec and Montreal. 



Fusus tornatus. 



Trophon Scalarifo rme. 



Ma rgarifa helicina . 



Cylichna occulta. 



Pecten Islcmdicus. 



Tellina calcarea. 



Leda truncata. 



Saxicava rugosa. 



Aphrodite Groenlandica. 



Myfilus edulis. 



My a arenaria . 



Balanus Hameri. 



Spirorbis spirillum. 



S. vitrea. 



Serpula vermicularis. 



