1418 BULLETIN" 92, UNITED STATES NATIONAL MUSEUM. 



Superfamily STROPHOMENACEA. 



Family Strophomenidn King. 



Christiania Hall and Clarke, Leptsena Dalman, Leptella Hall and Clarke, Mimulus 

 Barrande, Orthidium Hall and Clarke, Pholidostrophia Hall and Clarke, Plectam- 

 bonites Pander, Rafinesquina Hall and Clarke, Schucliertella Girty, Streptis David- 

 son, Stropheodonta Hall (subgenera Braehyprion Shaler, Leptostrophia Hall and 

 Clarke, Strophomena Blainville, Strophonella Hall (subgenus Stropboprian 

 Twenhofel), Triplecia Hall (subgenus CLiftonia Foerste). 



Family Production Gray. 

 Cbonetes Fischer. 



Superfamily PENTAMERACEA. 



Family Syntrophiidn Schuchert. 



Clarkella Walcott, Syntrophia Hall and Clarke. 



Family Clitambonitidn Winchell and Schuchert. 



Clitambonites Pander, Polytcechia Hall and Clarke, Scenidium Hall. 



Family Porambonitidn Davidson. 



Anastrophia Hall, Camarella Billings, Parastrophia Hall and Clarke, Porambonites 

 Pander. 



Family Pentamerid.e McCoy. 



Capellinia Hall and Clarke, Clorinda Barrande, Conchidium Linnaeus, Gypidula Hall 

 (subgenus Sieberella (Ehlert), Orthotropia Hall and Clarke, Pentamerella Hall, 

 Pentamerus Sowerby, Platymerella Foerste, Stricklandinia Billings, Virgiana 

 Twenhofel. 



Family Eichwaldiidn Schuchert. 



Dictyonella Hall, Eichwaldia Billings. 



Order Telotremata. 



Superfamily RHYNCHONELLACEA. 



Family Protorhynchidn Schuchert. 



Protorhyncha Hall and .Clarke. 



Family Rhynchonellidn Gray. 



Camarotoeebia Hall and Clarke (subgenus Stegerhynchus Foerste), Eatonia Hall, 

 Orthorhynchula Hall and Clarke, Rhynchonella Fischer, Rhynchotrema Hall, 

 Rhynchotreta Hall, Uncinulus Bayle, Wilsonia Kayser. 



Superfamily TEREBRATULACEA. 

 Family Centronellid^e Hall and Clarke. 

 Centronella Billings, Rensselajria Hall. 



Family Protozeugidn Twenhofel. 

 Protozeuga Twenhofel. 



Superfamily SPIRIFERACEA. 



Family Atrypid.e Gill. 



Atrypa Dalman, Atrypina Hall and Clarke, Catazyga Hall and Clarke, Clintonella 

 Hall and Clarke, Glassia Davidson, Lissatrypa Twenhofel, Zygospira Hall. 



Family Cyclospiridn Schuchert. 

 Cyclospira Hall and Clarke. 



