Superfamily Sphaeriacea 191 



Family Corbiculidae 191 



Superfamily Lucinacea 199 



Family Diplodontidae 199 



Family Lucinidae 206 



Superfamily Chamacea ~ 222 



Family Chamidae 222 



Superfamily Cyrenoidacea 227 



Family Cyrenoididae 227 



Superfamily Erycinacea 228 



Family Erycinidae 229 



Family Kelliidae 231 



Family Montacutidae 233 



Family Galeommatidae 239 



Family Sportellidae 241 



Status uncertain 243 



Superfamily Cardiacea 243 



Family Cardiidae 243 



Superfamily Veneracea .257 



Family Veneridae 257 



Family Petricolidae 314 



Family Cooperellidae 318 



Family uncertain, Genus Halodakra 319 



Superfamily Mactracea 320 



Family Mactridae 320 



Family Mesodesmatidae 334 



Superfamily Tellinacea 336 



Family Donacidae 336 



Family Sanguinolariidae 347 



Family Semelidae 358 



Family Tellinidae 375 



Order Adapedontida 419 



Superfamily Solenacea 419 



Family Solenidae 419 



Superfamily Myacacea 422 



Family Myacidae 422 



Family Hiatellidae 425 



Family Corbulidae 426 



Family Gastrochaenidae 439 



Superfamily Pholadacea 441 



Family Pholadidae 441 



Family Teredinidae 451 



Order Anomalodesmacea 452 



Superfamily Anatinacea 452 



Family Pandoridae 452 



Family Thraciidae 457 



Family Periplomatidae 460 



Superfamily Poromyacea 464 



Family Cuspidariidae 464 



Family Poromyidae 466 



Family Lyonsiidae 467 



Family Verticordiidae 469 



New genera and subgenera proposed in this work 471 



Plates 474-558 



