SOME LOCAL DETAILS. 181 



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 Hat 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 

 Pleistocene 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 Tellina Grcenlandica, 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 Spirorlis spirillum and Aphrodite Grcenlandica, 

 have been found in these deposits at Quebec and 

 Montreal : 



Fusus tornatus. 



Trophon scalariforme. 



Margarita helicina. 



Cylichna occidta. 



Pecten Islandicus. 



Tellina ealcarea. 



Leda truncata. 



Saxicava rugosa. 



Aphrodite Grcenlandica. 



Mytilus edidis. 



Mya arenaria. 



Balanus Hameri. 



Spirorlis spirillum. 



S. vitrea. 



Serpida vermicularis. 



