A MONOGRAPH 
OF THE 
BRITISH FOSSIL BRACHIOPODA. 
ET 
THOMAS DAVIDSON, F.R.S,, F.L.S., F.G.S., 
VICE-PEESIDENT OF THE PALfiONTOGEAPHICAl SOCIETY ; MEMBEE OF THE GEOLOGICAL SOCIETIES OF FEANCE, BELGIUM: 
EDINBTOGH, AND GLASGOW ; FOEEIGN MEMBEE OF THE PEOVINCIAL INSTITUTE OP FEANCE ; OF THE LINNEAN SOCIETY 
OF NOEMANDY; OF THE IMPEEIAL MINEEALOGIOAL SOCIETY OF ST. PETEESBUEG; OF THE IMPEEIAL SOCIETY 
OF NATUEALISTS OF MOSCOW ; OF THE EOYAL ACADEMIES OF BELGIUM AND BAVAEIA ; OF THE EOYAL 
SOCIETY OF HOLLAND, HAAELEM ; OF THE EOYAL SOCIETY OF LIEGE ; OF THE ACADEMY OF ST. 
LOUIS; OF THE AMEEICAN PHILOSOPHICAL SOCIETY, PHILADELPHIA; OF THE INSTITUTE OF 
ALBANY, UNITED STATES ; OF THE ZOOLOGICAL SOCIETY OF VIENNA ; OF THE PALffiONTO- 
GEAPHICAL SOCIETY OF BELGIUM AND OF SWITZEELAND ; OP THE MALACOLOGICAL 
SOCIETY OP BELGIUM; HON. MEMBEE OF THE GEOLOGISTS' ASSOCIATION, 
LONDON ; HON. MEMBEE OF THE DUDLEY AND MIDLAND GEOLOGICAL 
AND SCIENTIFIC SOCIETY ; AND OF THE YOEKSHIEE 
PHILOSOPHICAL SOCIETY, ETC. ETC. 
VOL, IV. 
PART II L 
SUPPLEMENT TO THE PERMIAN AND CARBONIFEROUS SPECIES. 
Pages 243—315; Plates XXX— XXXVII. 
PRINTED FOR THE 
LONDON : 
PALiEONTOGRAPHICAL 
1880. 
SOCIETY, 
