CLASS LAMELLIBRANCHIATA. 



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



Limoptera, Mytilarca. 

 FAMILY ANATINIDiE. — Allorisma, Amphicoelia, Anatina, Chsenomya, Chsenocardia, 



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



Sedgwickia. 

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



Ptychodesma, Solenomya, Tellinomya. 

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



Eucbondria, Gervillia, Inoceramus, Leiopteris, Monopteria, Monotis, Posidonia, 



Posidonomya, Pseudomonotis. 

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

 FAMILY CARDIOMORPHID^E.— Cardiomorpha, Edmondia. 

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



Cypricardella, Cypricai'dia, Cypricardinia, Cypricardites, Isocardia, Matheria, 



Pleurophorus. 

 FAMILY CYTHERODONTID.E.— Cytherodon, Schizodus. 

 FAMILY GRAMMYSIDyE.— Grammysia. 

 FAMILY LUC1NID,E.— Axinus, Lucina, Paracyclas. 

 FAMILY MODIOMORPHID.E.— Goniopbora, Modiomorpha. 

 FAMILY MYACIDJS.— Anthracoinya. 

 FAMILY MYTILID^E. — Anodontopsis, Anthracoptera, Lithopbaga, Modiola, Modiolop- 



sis, Myalina, Mytilus. 

 FAMILY NUCULIDiE.— Nucula, Nuculana, Nuculites, Pyrenomceus, Yoldia. 

 FAMILY NYASSID^.— Nyassa. 



FAMILY ORTHONOTID^.-Orthodesma, Orthonota. 

 FAMILY OSTREIDiE.— Lima, Ostrea, Placunopsis. 

 FAMILY PALANATINID.E.-Palanatina. 



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

 FAMILY PHOLADELLID/E.— Cimitaria, Palteoneilo, Pholadella, Phthonia. 

 FAMILY PINNIID^E.— Pinna, Pinnopsis. 

 FAMILY PTERINIID/E.— Pterinea, Pteronites, Pteronitella.' 

 FAMILY SANGULNOLITILLE.— Sanguinolites. 

 FAMILY SOLENID,E.— Solen, Solenopsis. 

 FAMILY TELLINID,E.— Sanguinolaria, Tellinopsis. 

 FAMILY TRIGONIID^E.— Dolabra, Iscbyrinia, Lyrodesma. 

 FAMILY UNIONID^E.-Anthracosia. 



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



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

 crueiforme, Conrad, 1841, (Avicula cruci- 



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



[Sig. cross-sbaped.] 

 erectum, Conrad, 1842, (Avicula erecta) 



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



[Sig. erect.] 



Allorisma, 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. Carb. [Sig. ancient.] 



