lOO 



ROYAL SOCIETY OF CANADA 



Zirphaea crispata, 

 Xlyophaga drosalis, 

 Xylotrya bipinnata, 

 Xylotrya fimbriata, 

 Cylichna cylindracea, 

 Diaphana pellucida, 

 Haminea hydatis, 

 Bela Trevelyana, 



Triforis adversa, 

 Cerithiopsis tuber cularis, 

 Lacuna vincta, 

 Velutina laevigata, 

 Margarita helicina, 

 Emarginula crassa, 

 Lepidopleurus cancellatus, 

 Tonicella marmorea. 



Many of our land and freshwater shells are also common to the 

 two continents, and a few species, ^Macoma lata, ^Natica clausa, *Admete 

 Couthouyi, are found in England in a subfossil condition, though still 

 living in our waters. 



The foregoing list may be lengthened if we admit the following 

 identifications : — 



BRITISH COLUMBIAN. 



Tercbratulina unguicula, 

 Lucina acutilineata, 

 Dentalium indlanorum, 

 Bela fidicula, 

 Purpura crispata, 

 Eulitna micans, 

 Eulima, sp., 

 Trichotropis cancellata, 

 Littorina sitkana, 

 Acmwa patina, 

 Punc.turella galeata. 



BRITISH. 



T, caput-serpentis, 

 L. borealis, 



D. entale, 



B. turricula, 

 P. lapillus, 



E. polita, 

 E. distorta, 

 T. borealis, 

 L. rudis, 



A. testudinalis, 

 P. Noachina. 



The twenty-eight species in the foregoing lists that are marked with 

 asterisks, and the following fifteen species, are known to occur also on 

 the Atlantic coast of Canada : — 



Ostrea Virginica 

 Modiolaria laevigata, 

 Yoldia thraciceformis, 

 Yoldia limatula, 

 Astarte undata, 

 Serripes Groenlandicus, 

 Venericardia borealis (= ? ventricosa), 

 Bela exarata, 



Bela violacea, 



Buccinum cyaneum, 



Chrysodomus liratus, 



Trophon clathratus ( = ? multicostatua), 



Mesalia reticulata, 



Alvania castanea, 



Solariella varicosa. 



