27 



OSTRE^. 



630 Ostrca Borealis 



631 Cochlear 



632 cristata 



633 Gallina 



634 parasitica, one magnificent specimen 



635 denticulata 



636 Ruscuriana 



63/ Virgiuica, several small specimens 



638 Canadensis? 



639 • cdulis 



640 • Cornucopia; 



641 cucullata 



642 Liniacclla 



643 Folium 



644 Crista-Galli 



645 tiirbinata? 



646 imbricata 



647 Hyotis 



648 



649 . 



650 



651 



652 



653 



654 



655 



656 



657 



658 



VULSELLA. 



659 Vulsella lingulata, foiu* varieties 



