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Shells with the ears 



equal, 



or nearly so. 



Pecten maximus 



Pecten rastellum 



medius 











Jacobaeus 





■ • flagellatus 



bifrons 











ziczac 





• flavidulus 



Laurentii 





• plica 



pleuronectes 





• • glaber 



obliterates 



Japonicus 





• sulcatus 





• • virgo 



Magellanlcus 





• unicolor 



purpuratus 











lineolaris 





• distans 



radula 





• isabella 



Shells with the ears unequal. 

 Pecten nodosus Pecten lineatus 



pallium 



flabellatus 



pesfelis 



irradians 



tigris 



flexuosus 



imbricatus 



inflexus 



histrionicus 



dispar 



sauciatus 



quadriradiatus 



opercularis 



Islandicus 



