BKITISH 



FOSSIL BRACHIOPODA 



BY 



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



VICE-PRESIDENT OF THE PAL^ONTOGBAPniCAL SOCIETY; MEMBER OF THE GEOLOGICAL SOCIETIES OF FBANCE, EUINBUUGll 



AND GLASGOW ; FOEEIGN MEMBER OF THE PEOVINCIAL INSTITUTE OF FRANCE ; OF THE LINNEAN SOCIETY OV 



A'ORMANDY ; OF THE IMPERIAL MINEEALOGICAL SOCIETY OP ST. PETERSBURG; OF THE IMPERIAL SOCIETY OF 



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



SOCIETY OP HOLLAND, HAAELEM ; THE EOYAL SOCIETY OF LIEGE ; THE ACADEMY OF ST. 



LOUIS ; THE AMEEICAN PHILOSOPHICAL SOCIETY, PHILADELPHIA ; THE ZOOLOGICAL 



SOCIETY OF VIENNA; THE PALa:ONTOLOGICAL SOCIETY OF BELGIUM; 



HON. MEMBER OF THE DUDLEY AND MIDLAND GEOLOGICAL AND 



SCIENTIFIC SOCIETY, ETC. ETC. 



WITH 



OBSERVATIONS 



ON THE 



CLASSIFICATION OF THE SILURIAN ROCKS: 



BT 



SIE EODEEICK IMPEY MURCHISON, BAiia:., 



K.C.B., D.C.L., M.A., F.E.S., F.G.S., 



DIHECTOK-GE.NERAL OF THE GEOLOGICAL SURVEY OP GEEAT BRITAIN AND IRELAND ; PRESIDENT OF THE ROYAL GEOGRAPHICAL 



SOCIETY OF LONDON ; TRUSTEE OP THE BRITISH AND HUNTEEIAN MUSEUMS, AND OF THE BEITISH ASSOCIATION 



FOE THE ADVANCEMENT OP SCIENCE ; COEEESPOHDING MEMBEE OF THE INSTITUTE OF FRANCE ; 



MEMBEE OP THE IMPERIAL ACADEMY OP SCIENCE, AND GEOGEAPHICAL SOCIETY OP 



ST. PETEESBUEGH ; HON. MEMBER OF THE ROYAL ACADEMIES OF BERLIN, 



COPENHAGEN, STOCKHOLM, BRUSSELS, MUNICH, HOLLAND, 



TUEIN, ETC. 



VOL. III. 



DEVONIAN AND SILURIAN SPECIES. 



LONDON : 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1864—1871. 



