A MONOGRAPH 



OF THE 



BRITISH FOSSIL BRACHIOPODA. 



PART VII. NO. II. 



COXTAINING 



Pages 89— 168; Plates XIII— XXII. 



THE SILURIAN BRACHIOPODA. 



BY 



THOMAS DAYIDSON, F.R.S., F.G.S., 



VICE-I'HESIDENT OF THE PALilONTOGKAPHICAL SOCIETY; MESIBEE OF THE GEOLOGICAL SOCIETIES OF FEAN'CE, EDINBURGH, 

 AND GLASGOW, MEMBEE ETEANGEE DE L'INSTITUT DES PEOVINCES, FEANCE, AND LINNEAN SOCIETY OF NOEMANDY ; 

 IMPEEIAL MINEEALOGICAL SOCIETY OF ST. PETEESBITEG ; EOYAL ACADEMIES OF BELGItlir AND OF BAVAEIA ; 

 SOCIETE EOYALE HOLLANDAISE DES SCIENCES, HAELEJI ; EOYAL SOCIETY OF LIEGE ; ACADEMY OF 

 ST. LOXTIS ; AMEEICAN PHILOSOPHICAL SOCIETY, PHILADELPHIA ; ZOOLOGICAL SOCIETY OF 

 VIENNA ; PALiEONTOGEAPHICAL SOCIETY OF BELGIUM ; HON. MEMBEE OF THE 

 DUDLEY AND MIDLAND GEOLOGICAL AND SCIENTIFIC SOCIETY, ETC. 



LONDON: 

 PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 

 1867. 



