THE MIOCENE PERIOD 



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Fig. 552. MIOCENE PELECYPODS: a and b, Area (Scapharca) staminea Say; 

 c and d, Corbula idonea Conrad; e, Crassatellites marylandicus (Conrad); 

 /, Phacoides (Pseudomiltha) foremani (Conrad); g, Tellina (Angulus) 

 producta Conrad; h, Leda concentrica (Say); i, Modiolus dalli Glenn; 

 /, Astarte thomasii Conrad; k, Ensis directus (Conrad); I, Spisula 

 (Hemimactra) marylandica Dall; w, Isocardia markoei Conrad; n, Car- 

 dium (Cerastoderma) leptopleurum Conrad; o, Pecten (Chlamys) madi- 

 sonius Say; p, Venus ducatelli Conrad; q, Ostrea carolinensis Conrad. 

 (Maryland Geol. Surv.) 



