A MONOGRAPH 



BEITISH FOSSIL BRACHIOPODA. 



THOMAS DAVIDSON, LL.D., F.R.S.. P\L.S., F.O.S., 



VICE-PEESIDENT OF THE PAIi^ONTOGBAPHICAL SOCIETY; MEMBEE OP THE GEOLOGICAL SOCIETIES OF FE4NCE, BELGIUM, 



BDINBUEGH, GLASGOW, AND OF COENWALL ; FOEEIGN MEMBEE OF THE PEOVINOIAL INSTITUTE OF FEANCE ; OF THE 



LINNEAN SOCIETY OF NOKMANBY; COEBESPONDING MEMBER OF THE IMPEEIAL ACADEMY OF SCIENCES OP ST. 



PETEE9BUEG; OF THE IMPEEIAL MINEBALOGICAL SOCIETY OP ST. PETEESBUBG; OP THE IMPEEIAL SOCIETY 



OF NATUBALI8TS OF MOSCOW; OF THE ROYAL ACADEMIES OF BELGIUM AND BAVAEIA ; OF THE EOYAL 



SOCIETY OF HOLLAND, HAAELEM ; OF THE EOYAL SOCIETY OF LIEGE; f>F THE ACADEMY OF ST. 



LOUIS; OF THE AMEEICAN PHILOSOPHICAL SOCIETY, PHILADELPHIA; OP THE INSTITUTE OF 



ALBANY, UNITED STATES ; OF THE ZOOLOGICAL SOCIETY OF VIENNA ; OF THE PAL«ONTO- 



GEAPHICAL SOCIETIES OP BELGIUM AND OF SWITZBELAND; OP THE MALACOLOGICAL 



SOCIETY OF BELGIUM; HON. MEMBEE OP THE GEOLOGISTS' ASSOCIATION, 



LONDON ; OF THE DUDLEY AND MIDLAND GEOLOGICAL AND SCIENTIFIC 



SOCIETY ; OF THE NATUEAL HISTOBY SOCIETY OF GLASGOW : AND 



OF THE YOBKSIIIBE PHILOSOPHICAL SOCIETY, ETC. ETC. 



VOL. V. 



PART II. 

 SILURIAN SUPPLEMENT. 



Pages 135—242; Plates VIII— XVII. 



LONDON : 



PRINTED FOR THE P AL^O NTOGR AP H IC AL SOCIETY. 



1883. 



