432 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



ancient oceanic shore, and indicate the limit of elevation the land 

 has experienced since the plains of Canada were raised from beneath 

 the waters. This elevation is 24-0 feet above the level of Lake 

 Ontario and seventy-five feet above the Falls of Niagara; but it 

 falls short of Lake Erie by about 105 feet. 



It is remarked by Mr. Lyell that the Quebec shells resemble those 

 of Uddevalla in Sweden. Every one of the species found near Mon- 

 treal has, I understand, a representative among those observed by 

 Mr. Murchison and his companions in their late Russian investiga- 

 tions at Ust Vaga, at the mouth of the Vaga on the Dwina, about 

 250 miles from the White Sea and LSO feet above its level. 



List of Fossil Shells from Montreal, 



1 . Saxicava rugosa. This is very abundant on the mountain near 

 the town, to the north of the road to the Cote de Neiges. The lo- 

 cality is ^SO feet above the St. Lawrence, and the fossils lie in a bed 

 of coarse sand, which inclines conformably with the side of the hill, 

 and has above it a layer of pebbles and small boulders. The shell 

 occurs also, but not in abundance, above the village of St. Henry, 

 on the road to Lachine. Here the fossils are at the top of the 

 deposit which forms an elevated terrace along the bank of the St. 

 Lawrence, about 120 feet above the river. Another locality is on 

 Logan's farm on the same terrace. 



2. Tellina Groenlandica, This shell is in great abundance at the 

 St. Henry locality. It occurs in smaller quantity on Logan's farm 

 and on the mountain. 



3. Tellina calcaria. Only one valve of this was picked up in the 

 mountain locality. 



4. Mya truncata. Several hinges of this were found at the St. 

 Henry locality. 



5. Mytilus ? Only a broken piece of a valve was found on 



the mountain. 



