TAliLE OF I'AMILIES, GENERA, AND SOBGIONEUA. XXiU 



Family MYTiLiDiE : page 



Mytilus 327 



Septifer 328 



Modiola 329 



Creiiella 329 



Family ARCiDiE : 



Area 330 



Barbatia 331 



Plagiarca ...... 335 



Fossularca ..... 335 



Cucullsea 336 



Pectimculus 339 



Limarca ... .... 343 



Limopsis 344 



Family NuculiDjE : 



Nucula 347 



Family Nucolanid.e : 



Nuculana 348 



Family Trigoniid^e : 



Trigonia ........ 352 



Family Unionid^ : 



Uoio 355 



Anodonta 356 



Family Carditid^ : 



Cardita 357 



Carditella 362 



Family Crassatellitid.E : 



Crassatellites 363 



Family Cardiid.i: : 



Cardium 366 



Protocardium 368 



Family Chamidje : 



Chama 369 



Family VEXERiDiE ; 



Meretrix 370 



Sunctta 372 



Chione 372 



Family Ungulinid.'e : 



Diplodonta 375 



Family Donacid^'e : 



Doiiax 376 



