MONOGRAPH 



ON THE 



LIAS AMMONITES 



OF 



THE BRITISH ISLANDS. 



BY 



THOMAS WRIGHT, M.D. 5 F.R.S. Edin., F.G.S., 



VICE-PRESIDENT OF THE PAL.EONTOGRAPHICAL SOCIETY; CORRESPONDING MEMBER OF THE ROYAL SOCIETY OF SCIENCES 



OF LIEGE ; THE SOCIETY OF NATURAL SCIENCES OF NEUCHATEL ; 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 FIRST.— THE LIAS FORMATION. 



Pages 1—48; Plates I— VIII. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 



1878. 



