. College collection of palaeontology. 124 MOLLUSC A. No. 350. Ostrea,. From the Petrified Forest, Nunimulitic Eocene, near Cairo, Egypt. No. 351. G-ryphea arcuata, Lam. (Gryphea incurva, Sow.) This genus, belonging to the Oyster Family (Ostreidse), is exclusively Mesozoic; 30 species known. The left valve has a prominent incurved umbo. From the Lias, Lyme-Regis, England. No. 352. Gryphea vesicularis, Lam. Upper Cretaceous, Marlborough, N. J. No. 353. Exogyra arietina, d'Orb. In this member of the Oyster family, also restricted to the Cretaceous, the beak is reversed or turned posteriorly. Fro
. College collection of palaeontology. 124 MOLLUSC A. No. 350. Ostrea,. From the Petrified Forest, Nunimulitic Eocene, near Cairo, Egypt. No. 351. G-ryphea arcuata, Lam. (Gryphea incurva, Sow.) This genus, belonging to the Oyster Family (Ostreidse), is exclusively Mesozoic; 30 species known. The left valve has a prominent incurved umbo. From the Lias, Lyme-Regis, England. No. 352. Gryphea vesicularis, Lam. Upper Cretaceous, Marlborough, N. J. No. 353. Exogyra arietina, d'Orb. In this member of the Oyster family, also restricted to the Cretaceous, the beak is reversed or turned posteriorly. From the Cretaceous, Griffith Ravine, Texas. No. 354. Exogyra costata, Say. From the Greeusand, Marlborough, N. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward's Natural Science Establishment, inc. Rochester
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