A MONOGRAPH 



or THE 



BRITISH FOSSIL BMCHIOPODA. 



PART VII. NO. IV. 



CONTAINING 



Pages 249—397 ; Plates XXXVIII— L. 



THE SILURIAN BRACHIOPODA. 



BY 



THOMAS DAVIDSON, F.R.S., F.G.S., 



VICE-PRESIDENT OF THE PALiEONTOGBAPHICAL SOCIETY; MEMBER OF THE QEOLOQICAL SOCIETIES OF FRANCE, EDINBUH(iH, 



AND GLASGOW; FOREIGN MEMBER OF THE PROVINCIAL INSTITTJTE OP FRANCE; OP THE LINNEAN SOCIETY OF 



NORMANDY ; OF THE IMPERIAL MINERALOGICAL SOCIETY OF ST. PETERSBURG ; OF THE IMPERIAL SOCIETY OF 



NATURALISTS OF MOSCOW ; OF THE ROYAL ACADEMIES OF BELGIUM AND BAVARIA ; OF THE ROYAL 



SOCIETY OF HOLLAND, HAARLEM ; THE ROYAL SOCIETY OF LIEGE ; THE ACADEMY OF ST. 



LOUIS ; THE AMERICAN PHILOSOPHICAL SOCIETY, PHILADELPHIA ; THE ZOOLOGICAL 



SOCIETY OF VIENNA ; THE PAL^ONTOLOGICAL SOCIETY OF BELGIUM ; 



HON. MEMBER OF THE DUDLEY AND MIDLAND GEOLOGICAL AND 



SCIENTIFIC SOCIETY, ETC. ETC. 



LONDON : 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 

 1871. 



