BRITISH SILURIAN BRACHIOPODA. 



73 



Orbiculoidea Forbesii, Dav. 



DisciNA rugata, Sow.... 



— Morrisii, Dav. 



— striata, Sow. ... 



Pholidops (crania) implicata, Sow. 

 DiNOBOLUs Davidsoni, >S'a^fer 



GENERA AND SPECIES OF BRACHIOPODA. 



r. Rare. 



rr. Very rare. 



cr. Not very abundant. 



c. Comraon. 



cc. Very abundant. 



Ludlow Series. 



Wenlock Series. 



Waluheimia Mawii, Dav. 

 — ? Glassii, Dav. 



NucLEOSPiBA pisum, Sow. 



Retzia Salteri, Dav. ... 

 — Bouchardi, Dav. 



Meristina didyma, Dalman, sp. 



Whitfieldia tumida, !)«/ 



Athtbis Iseviuscula, Sow 



Dayia navicula, Soiv 



Spirifera plicatella, et var. radiata, Sow, 



— var. interlineata, Sow 



— crispa, Linne 



— elevata, Z)a^»2are 



— &\x\c&ta, Hisinger 



Cyrtia exporrecta, Wahl. 



Atrypa reticularis, Linne 



— asperula, Dav. ... 



— marginalis, Dal.... 



— imbricata, Sow. ... 



— Barrandi, Dav. ... 



— ? Mawei, Dav 



Glassia obovata, Sow., sp. 

 — elongata, Dav 



Streptis Grayi, Dav 



EiCHWALDiA Capewelli, Dav. . 

 Triplesia Wenlockiensis, Dav. 



