No. 4.] DAWSON — POST-PLIOCENE. 387 



Bulla (^Haminea) solitaria, Say. 



Fossil — Montreal; rather common. 



Recent — New England and northward. 



If this species is rightly determined, it furnishes a curious in- 

 stance of a somewhat southern species occurring in the drift of 

 Montreal. The Jlaminece, however, can scarcely be identified by 

 weathered or fossil specimens, so that this may possibly be a nor- 

 thern form distinct from solitaria. 



Bulla (^Dia2)hana) dehilis, Gould. 



Fossil — Montreal. 



Recent — Gulf St. Lawrence (Whiteaves) ; Greenland to New 

 England. 



Jeffreys considers it the same with B. hi/alina, Turton. If so, 

 it is a shell of the Clyde beds and of the Arctic seas generally. 



Bulla (^Utricidus) pertenuis^ Mighels. 



Fossil — Montreal. 



Recent — Labrador (Whiteaves) ; Gulf St. Lawrence, and 

 south to Cape Cod. According to Jeffreys it is U. turritus, 

 Moller, Greenland. 



Helix sti'iatella, Anthony. 



Fossil — Pakenham, Saxicava sand. 



Lymnea iimhrosa, Say. 

 Fossil — Montreal. 



Lymnea cajJerata, Say. 

 Fossil — Montreal. 



Lymnea elodes, Say. 



Fossil — Pakenham Mills, Saxicava sand. 



Flanorhis bicarinatus, Say, 



Fossil — Pakenham Mills, Saxicava sand. 



Planorhis trivolvis, Say. 



Fossil — Pakenham 3Iills, Saxicava sand. 



Planorhis parvus^ Say. 



Fossil — Pakenham Mills, Saxicava sand. 



All of the above pulmonates are modern Canadian species, and 

 seem to have been drifted by some fresh-water stream into the 

 sea of the Saxicava sand and Leda clay. 



