I9I3-] STRATIGRAPHY OF PACIFIC COAST OF AMERICA. 597 



Natica clatisa B. & S.^'' 



Nucella dccemcostata Midd. {Purpura lima auct.)-^''^ 

 Nucella lamellosa Gmel. {Purpura crispata Chem.).^''' 

 Nucella saxicola Val.^'' 

 Olivella biplicata Sby.^'' 

 Olivelia pedroana Conr.^^ 

 Polinices draconis Dall.^''' 

 Polinices pallida B. & S.^^ 

 Pimcturella galeata Gld.^^ 

 Purpura foliata Gmel.^^ 

 Sipho halibrectus Dall.^'' 

 Solariella cidaris A. Ad.s^ 

 Trichotropis cancellata Hds.^" 

 Tritonalia lurida Midd.^^ 

 Tritonifusus rectirostis Dall.^''' 

 Turris perversa Gabb.^'^ 

 . Turris smithi Arn. 

 Brachiopoda : 



Hemithyris psittacea L. 



ECHINODERMATA : 



Scutella oregonensis Clark. 



The Saanich Formation (Pleistocene). 



Benching the Oligocene and glacial deposits at Alki Point and 

 Bainbridge Island in Puget Sound, filling glacial depressions at 

 various points north of Victoria on the Saanich Peninsula of Van- 

 couver Island, and terracing the length and breadth of the Straits 

 of Georgia notably the Sucia Islands is a raised beach deposit for 

 which the writers propose the name Saanich Formation. This for- 

 mation carries numerous mollusca, usually species now living in 

 adjacent waters, but others extinct or like Pecten islandicus Miiller, 

 Cardium dccoratum Grnk. and Mya arenaria L. are now native only 

 off the Alaska coast or at other arctic points. In this respect it 

 resembles the lower San Pedro fauna which contains species now 

 confined several hundred miles or more northward. 



Overlying the marine deposits in several glacial hollows on the 

 Saanich Peninsula are peat and marl beds containing numerous 

 freshwater shells, the species being identical with those found in 

 adjacent lakes. It appears that after the Post-Saanich elevation 



5" Species still living. 



