A MONOGRAPH 



OF THE 



BRITISH FOSSIL BRACHIOPODA. 



BY 



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



VICE-PRESIDENT OF THE PALSONTOGRA.PHICAL SOCIETY ; MEMBER OP THE GEOLOGICAL SOCIETIES OP PRANCE, BELGIUM. 



EDINBURGH, AND GLASGOW; FOREIGN MEMBER OP THE PROVINCIAL INSTITUTE OF FRANCE; OF 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 OP HOLLAND, HAARLEM ; THE ROYAL SOCIETY OF LIEGE ; THE ACADEMY OF ST. LOUIS ; 



THE AMERICAN PHILOSOPHICAL SOCIETY, PHILADELPHIA; INSTITUTE OF ALBANY, UNITED 



STATES; THE ZOOLOGICAL SOCIETY OF VIENNA; THE PAL.EONTOGRAPHICAL SOCIETY 



OF BELGIUM AND OF SWITZERLAND ; THE MALACOLOGICAL SOCIETY OP BELGIUM ; 



HON. MEMBER OF THE GEOLOGISTS' ASSOCIATION, LONDON; HON. 



MEMBER OF THE DUDLEY AND MIDLAND GEOLOGICAL 



AND SCIENTIFIC SOCIETY ; YORKSHIRE 



PHILOSOPHICAL SOCIETY, 



ETC. ETC. 



YOL. IY. 



PART II. No. 2. 

 SUPPLEMENT TO THE JURASSIC AND TRIASSIC SPECIES. 



Pages 145—241; Plates XVII— XXIX. 



LONDON: 



PRINTED FOR THE PAL^ONTOGEAPHICAL SOCIETY. 



1878. 



