CLASS LAMELLIBRANCHIATA. 



FAMILY AMBONYCHIID^. — Ambonychia, Anomalodonta, Eopteria, Euchasma, 



Limoptera, Mytilarca. 

 FAMILY ANATINID^. — Allorisma, Amphicoelia, Anatina, Chsenomya, Chsenocardia, 



Clinopistha, Cuneamya, Dexiobia, Ilionia, Leptodomus, Promacrus, Prothyris, 



Sedgwick ia. 

 FAMILY ARCID^.— Carbonarca, Dystactella, Macrodon, Megalomus, Megambonia, 



Ptychodesma, Solenoraya, Tellinomya. 

 FAMILY AVICULIDiE. — Actinodesma, Avicula, Aviculopinna, Bakevellia, Entolium, 



Euchondria, Gervillia, Inoceramus, Leiopteris, Monopteria, Monotis, Posidonia, 



Posidonomya, Pseud omonotis. 

 FAMILY CARDIIDiE. — Cardiola, Cardiopsis, Cardium, Conocardium, Lunulacardium. 

 FAMILY CARDIOMORPHID^.— Cardiomorpha, Edmondia. 

 FAMILY CYPRINID^.— Astarte, Astartella, Cardinia, Cleidophorus, Cycloconeha, 



Cypricardella, Cypricardia, Cypricardinia, Cypricardites, Isocardia, Matberia, 



Pleurophorus. 

 FAMILY CYTHERODONTID.E.— Cytherodon, Schizodiis. 

 FAMILY GRAMMYSID^.— Grammysia. 

 FAMILY LUCINID^.— Axinus, Lucina, Paracyclas. 

 FAMILY MODIOMORPHIDtE.— Goniophora, Modiomorpha. 

 FAMILY MYACID.E.— Anthracomya. 

 FAMILY MYTILID^.— Anodontopsis, Anthracoptera, Lithophaga, Modiola, Modiolop- 



sis, Myalina, Mytilus. 

 FAMILY NUCULID^. — Nucula, Nuculana, Nuculites, Pyrenomoeus, Yoldia. 

 FAMILY NYASSID^.— Nyassa. 



FAMILY ORTHONOTIDtE— Orthodesma, Orthonota. 

 FAMILY OSTREID^.— Lima, Ostrea, Placunopsis. 

 FAMILY PALANATINID.E.-Palanatina. 



FAMILY PECTINIDiE. — Aviculopecten, Lyriopecten, Pernopecten, Streblopteria. 

 FAMILY PHOLADELLID.E.— Cimitaria, PaliEoneilo, Pholadella, Phthonia. 

 FAMILY PINNIID.E.— Pinna, Pinnopsis. 

 FAMILY FTERINIID^.— Pterinea, Pteronites, Pteronitella. 

 FAMILY SANGUINOLITIDiE.— Sanguinolites. 

 FAMILY SOLENID^.— Solen, Solenopsis. 

 FAMILY TELLINID^.— Sanguinolaria, Tellinopsis. 

 FAMILY TRIGONIID^.— Dolabra, Ischyrinia, Lyrodesma. 

 FAMILY UNIONID^.-Anthraco8ia. 



Actinodesma, Hall, 1877, Pal. N. Y., vol. 5. 



[Ety. aktiriy a beam ; desma^ a liganjent.] 

 cruciforrae, Conrad, 1841, (Avicula cruci- 



formisi Ann. Rep. N. Y., Ham. Gr. 



[8ig. cros8-«haped.] 

 erectum, Conrad, 1842, (Avicula erecta) 



Jour. Acad. Nat. Sci., vol. 8, Ham. Gr. 



[Sig. erect.] 



Allokisma, King, 1844, Ann. Mag. Nat. 

 Hist., vol. 14. [Ety. alios, variable; 

 ereistna, support, expressive of the va- 

 riable nature of the cartilage support 

 or lulcrum.] 



altirostrata, see Sedgwickia altirostrata. 



antiqua, Swallow, 18()3, Trans. St. Louis 

 Acad. Sci., Low. Carb. [Sig. ancient.] 



