CLASS LAMELLIBRANCHIATA. 



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



Limoptera, Mytilarca. 

 FAMILY ANATINIDjE.— Allorisma, Amphicoelia, Anatina, Chsenomya, Chssnocardia, 



Clinopistha, Cuneamya, Dexiobia, llionia, Leptodomus, Promacrus, Prothyris, 



Sedgwickia. 

 FAMILY ARCID^. -Carbonarca, Dystactella, Macrodon, Megalotnus, Megambonia, 



Ptychodesma, Solenomya, Tellinomya. 

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



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



Posidonomya, Pseudomonotis. 

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

 FAMILY CARDIOMORPHIDiE.— Cardiomorpha, Edmondia. 

 FAMILY CYPRINIDiE.— Astarte, Astartella, Cardinia, Cleidophorus, Cycloconcha, 



Cypricardella, Cypricardia, Cypricardinia, Cypricardites, Isocardia, Matheria, 



Pleurophorus. 

 FAMILY CYTHERODONTID.E— Cytherodon, Schizodus. 

 FAMILY GRAMMYSID^.— Grammysia. 

 FAMILY LUCINIDiE.— Axinus, Lucina, Paracyclas. 

 FAMILY MODIOMORPHID^.— Goniophora, Modiomorpha. 

 FAMILY MYACID^.— Antliracomya. 

 FAMILY MYTILIDjE. — Auodontopsis, Anthracoptera, Lithophaga, Modiola, Modiolop- 



sis, Myalina, Mytilus. 

 FAMILY NUOULID^E. — Nucula, Nuculana, Nuculites, Pyrenomoeus, Yoldia. 

 FAMILY NYASSIDiE.— Nyassa. 



FAMILY ORTHONOTID^.— Oi-thodesma, Orthonota. 

 FAMILY OSTREID.E —Lima, Ostrea, Placunopsis. 

 FAMILY PALAMATINID.E.-Palanatina. 



FAMILY PECTINID^. — AvU'ulopecten, Lyriopeeten, Pernopecten, Streblopteria. 

 FAMILY PHOLADELLIDiE— Oimitaria, P.ilasoneilo, Pholadella, Phthonia. 

 FAMILY PI>fNIID.E.— Pinna, Pinnnpsis. 

 FAMILY PTERIN IID^.—Pterinea, Pteronites, Pteronitella. 

 FAMILY SANGUINOLITID^.— Sanguinolites. 

 FAMILY SOLENID/E.— Solen, Solenopsis. 

 FAMILY TELLINID^.— Sanguinolaria, Tellinopsis. 

 FAMILY TRIGONIID^.— Dolabra, Ischyrinia, Lyrodesma. 

 FAMILY UNIONIDyE. — Anthraoosia. 



AcTiNODESMA, Hall, 1877, Pal. K. Y., vol. 5. 



[Ety. aktin, a beam ; ilenrtja, a ligament.] 

 cruciforme, Conrad, 1841, (Avii^ula cruci- 



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



[Sig. cross-shaped.] 

 erectum, Conrad, 1842, (Avicula erecta) 



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



[Sig. erect.] 



Allobi.sma, King, 1844, Ann. Mag. Nat. 

 Hist., vol. 14. LEty. alios, variable; 

 ereisnia, 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. Carb. [Sig. ancient.] 



