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EXPLANATION OF PLATE III. 



A. 1. Left valve of MfTjfrj'.r. 

 2. Right „ 



B. 1 . Left valve of Mactra. 

 2. Right „ 



C. 1. Left valve of iiic^wa. 

 2. Right „ 



D. 1. Left valve of Pecten. 

 2. Right „ „ 



E. 1. Left valve of Pectttnculus. 

 2. Right „ 



LA = auterior lamella. 

 IjP= posterior lamella. 

 1, 2 ff, 2 b, &c. = cardinal teeth. 



A = anterior dysodont tooth. 

 P = posterior dysodont tooth. 



