CLASS LAMELLIBRANCHIATA. 



FAMILY AMBONYCHIIDjE. — Ambonychia, Anomalodonta, Eopteria, Euchasma, 



Limoptera, Mytilarca. 

 FAMILY ANATINID2E. — AUorisma, Amphicoelia, Anatina, Chasnomya, Chsenocardia, 



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



Sedgwickia. 

 FAMILY ARCIDjE. — Carbonarca, Dystactella, Macrodon, Megalomus, Megambonia, 



Ptychodesma, Solenomya, Tellinomya. 

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



Euchondria, GerviUia, Inneeramus, Leiopteris, Monopteria, Monotis, Posidonia, 



Posidonomya, Pseudomonotis. 

 FAMILY CA.KD11VM. — Cardiola, Cardiopsis, Cardium, Conocardium, Lunulacardium. 

 FAMILY CARDIOMORPHIDiE.— Cardiomorpha, Edmondia. 

 FAMILY OYPRINID^.— Astarte, Astartella, Cardinia, Cleidophorus, Cycloconcha, 



Cvpricardella, Cypricardia, Cypricardinia, Cypricardites, Isocardia, Matheria, 



Pleurophorus. 

 FAMILY CYTHERODONTID.E.— Cytherodon, Schizodus. 

 FAMILY GRAMMYSID.E.— Grammysia. 

 FAMILY LUCINIDiE.— Axinus, Lucina, Paracyclas. 

 FAMILY MODIOMORPHID^,— Goniophora, Modiomorpha. 

 FAMILY MYACIDiE.— Anthracomya. 

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



sis, Myalina, Mytilus. 

 FAMILY NUCULIDiE. — Nucula, Nuculana, Nuoulites, Pyrenomosus, Yoldia. 

 FAMILY NYASSID^.— Nyassa. 



FAMILY ORTHONOTIDiE.— Orthodesma, Orthonota. 

 FAMILY OSTREID.E— Lima, Ostrea, Placmiopsis. 

 FAMILY PALANATINIDyE.— Palanatina. 



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

 FAMILY PHOLADELLID^.— Cimitaria, Palajoneilo, Pholadella, Phthonia. 

 FAMILY PINNIID^.— Pinna, Pinnopsis. 

 FAMILY PTERINIID^.— Pterinea, Pteronites, Pteronitella. 

 FAMILY SANGUINOLITID^.— Sanguinolites. 

 FAMILY SOLENID^.— Solen, Solenopsis. 

 FAMILY TELLINIDiE.— Sanguinolaria, Tellinopsis. 

 FAMILY TRIGONIID^.— Dolabra, Ischyrinia, Lyrodesma. 

 FAMILY USIONID7E.-Anthraoo8ia. 



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



[Ety. nktin, a beam ; desma, a ligament. ] 

 cruciforme, Conrad, 1841, (Avicula cruci- 



formis) Ann. Rep. N. Y., Ham. Gr. 



[Sig. cross-shaped.] 

 erectum, Conrad, 1842, (Avicula erecta) 



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



[Sig. erect.] 



Allohisma, King, 1844, Ann. Mag. Nat. 

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

 ereisma, support, expressive of the va- 

 riable nature of the cartilage support 

 or fulcrum.] 



altirostrata, see Sedgwickia altirostrata. 



antiqua, Swallow, 1863, Trans. St. Louis 

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



