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Part 4 concludes the descriptions of early Jurassic bivalves from the Hettangian and Lower Sinemurian stages of south-west Britain. Fifty-four species are assigned to the subclass Pteriomorphia, including the genera  Grammatodon (Grammatodon), Grammatodon (Cosmetodon), Plagiostoma, Antiquilima, Pseudolimea, Ctenostreon, Otapiria, Oxytoma (Oxytoma), Palmoxytoma, Meleagrinella (Praemeleagrinella), Bositra, Terquemia, Placunopsis, Entolium (Entolium), Chlamys (Chlamys), Chlamys (Copeipecten)  subgen. nov.,  Pseudopecten (Pseudopecten), Camptonectes (Gandalfus)  subgen. nov.,  Eopecten, Harpax, Atreta, Liostrea, Gryphaea (Gryphaea) , including  G. (G.) lavernockensis  sp. nov.,  Gryphaea (Bilobissa), Nanogyra, Parainoceramya, Semuridia, Anningella, Pteria, Cuneigervillia, Gervillella, Gervillia (Gervillia), Gervillia (Cultriopsis)  and  Pinna (Pinna). Semuridia  and  Anningella  are placed in the new proposed family Anningellidae.

THE EARLY JURASSIC BIVALVIA FROM THE HETTANGIAN AND LOWER SINEMURIAN OF SOUTH-WEST BRITAIN. PART 4