Abra, 30 
Acteocina, 2 
Acteon, 2 
Agriolimax, 5 
Alasmidonta, 24 
Alectrion, 11 
Alexia, 2 
Amnicola, 16 
Anachis, 11 
Ancylus, 3 
Anisodonta, 27 
Anodonta, 25 
Anomia, 21 
Arca, 20 
Assiminea, 16 
Astyris, 11 
Atrina, 20 
Aurinia, 10 
Bifidaria, 4 
Blauneria, 2 
Bornia, 27 
Buccinum, 11 
Busycon, 10 
Cadulus, 19 
Caecum, 15 
Calliostoma, 17 
Calyptraea, 17 
Campeloma, 16 
Cancellaria, 8 
Cantharus, 11 
Cardium, 27 
Carychium, 2 
Cassis, 14 
Cerithidea, 15 
Cerithiopsis, 15 
Chaetopleura, 19 
INDEX TO GENERA 
Chama, 26 
Chione, 28 
Chrysodomus, 11 
Circinaria, 6 
Cochliolepis, 18 
Codakia, 26 
Congeria, 22 
Corbula, 31 
Crassinella, 26 
Crenella, 22 
Crepidula, 17 
Cumingia, 30 
Cyclinella, 28 
Cyclostrema, 18 
Cyrena, 25 
Dactylina, 31 
Dentalium, 19 
Diplodonta, 26 
Divaricella, 27 
Dolium, 14 
Donax, 30 
Dosinia, 28 
Drillia, 8 
Ensis, 30 
Epitonium, 12 
Erato, 14 
Ervilia, 31 
Euconulus, 5 
Euglandina, 6 
Eulima, 13 
Eupleura, 12 
Fasciolaria, 10 
Fissuridea, 18 
| Gafrarium, 28 
37 
