27 



OSTREA. 



630 Ostrea Borealis 



631 Cochlear 



632 cristata 



633 Gallina 



634 parasitica, one magnificent specimen 



635 denticulata 



636 Ruscuriana 



637 Virginica, several small specimens 



638 Canadensis ? 



639 edulis 



640 Cornucopiae 



641 cucullata 



642 Limacella 



643 Folium 



644 Crista-Galli 



645 tiirbinata ? 



646 inibricata 



647 Hyotis 



648 



649 



650 



651 



652 :- 



653 



654 



655 



656 



657 



658 



VULSELLA, 



659 Vulsella lingulata, four varieties 



