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EXPLANATION OF PLATE III. 



A. 1. Left valve of M(rjtn:v. 



2. Eight „ „ 



B. 1 . Left valve of Mactra. 

 2. Eight „ 



C. 1. Left valve of Lucinn. 

 2. Eight „ 



D. 1. Left valve of Peden. 

 2. Eight „ 



E. 1. Left valve of Pecf(wcv.'/v.?. 

 2. Eight „ „ 



LA = anterior lamella. 

 LP= posterior lamella. 

 1, 2a, 'lb, &c. = cardinal teeth. 



A = anterior dysodont tooth. 

 P = posterior dysodont tooth. 



