100 
* Zirphaea crispata, 
Xlyophaga drosalis, 
Xylotrya bipinnata, 
Xylotrya fimbriata, 
Cylichna cylindracea, 
Diaphana pellucida, 
Haminea hydatis, 
Bela Trevelyana, 
* 
* 
ROYAL SOCIETY OF CANADA 
Triforis adversa, 
Cerithiopsis tubercularis, 
* 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. 
Terebratulina unguicula, 
Lucina acutilineata, 
Dentalium indianorum, 
Bela fidicula, 
Purpura crispata, 
Eulima micans, 
Eulima, sp., 
Trichotropis cancellata, 
Littorina sitkana, 
Acmæa patina, 
Puncturella galeata. 
The twenty-eight species in the 
asterisks, and the following fifteen 
the Atlantic coast of Canada :— 
Ostrea Virginica 
Modiolaria laevigata, 
Yoldia thraciæformis, 
Yoldia limatula, 
Astarte undata, 
Serripes Groenlandicus, 
Venericardia borealis (= ? ventricosa), 
Bela exarata, 
BRITISH. 
T. caput-serpentis, 
L. borealis, 
entale, 
. turricula, 
. lapillus, 
polita, 
distorta, 
borealis, 
rudis, 
. testudinalis, 
Noachina. 
* * 
* * * x 
DEER DS 
foregoing lists that are marked with 
species, are known to occur also on 
Bela violacea, 
Buccinum cyaneum, 
Chrysodomus liratus, 
Trophon clathratus (=? multicostatus), 
Mesalia reticulata, 
Alvania castanea, 
Solariella varicosa. 
