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OSTREA, 



SECOND SECTION. 



Second Plate Fig. 1. Ostrea carinata, Lam. 



2. — Crista-galli. 



3. Folium. 



THIRD SECTION. 



Third Plate, Fig. I. Ostrea (Gryphcea ) angulatOy Lam. 



2. — incurva, Sowerby. 



3. dilatata ? jun. 



