MONOGRAPH 



ON THE 



LIAS AMMONITES 



OF 



THE BRITISH ISLANDS. 



BY 



THOMAS WRIGHT, M.D., F.R.S.Edin., F.G.S., 



VICE-PKESIDENT OF THE PALyEONTOGRAPHlCAL SOCIETY; CORRESPONDING MEMBER OK THE ROYAL SOCIETY OF SCIENCES 



OF LIEGE; THE SOCIETY OF NATURAL SCIENCES OF NEUCIIATEL; VICE-PRESIDENT OF THE COTTESWOLD 



naturalists' FIELD CLUB; CONSULTING SURGEON TO THE CHELTENHAM HOSPITAL; 



AND MEDICAL OFFICER OF HEALTH TO THE URBAN SANITARY DISTRICTS 



OF CHELTENHAM, CHARLTON KINGS, AND LECKHAMPTON. 



PART SECOND— THE LIAS FORMATION. 



Pages 49—164; Plates IX— XVIII. 



LONDON: 

 PRINTED FOR THE PAL.EONTOGRAPHICAL SOCIETY. 



1879. 



