1418 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Superfamily STROPHOMENACEA. 

 Family STROPHOMENID^E King. 



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

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

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

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

 Clarke, Strophomena Blainville, Strophonella Hall (subgenus Strophoprian 

 Twenhofel), Triplecia Hall (subgenus Cliftonia Foerste). 



Family PRODUCTION Gray. 

 Chonetes Fischer. 



Superfamily PENTAMERACEA. 



Family SYNTROPHIIDN Schuchert. 

 Clarkella Walcott, Syntrophia Hall and Clarke. 



Family CLITAMBONITID^E Winchell and Schuchert. 

 Clitambonites Pander, Polytoechia Hall and Clarke, Scenidium Hall. 

 Family PoRAMBONrrnx-E 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 EICHWALDUDN Schuchert. 



Dictyonella Hall, Eichwaldia Billings. 



Order TELOTREMATA. 



Superfamily RHYNCHONELLACEA. 

 Family PROTORHYNCHIDN Schuchert. 

 Protorhyncha Hall and Clarke. 



Family RHYNCHONELLID/E Gray. 



Camarotcechia 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^] Hall and Clarke. 

 Centronella Billings, Rensseleeria Hall. 



Family PROTezEUGnxE 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 CYCLOSPiRmN Schuchert. 

 Cyclospira Hall and Clarke. 



