A MONOGRAPH 



OF 



BRITISH TRILOBITES. 



BY 



J. W. SALTER, A.L.S., F.G.S., 



LATE OF THE GEOLOGICAL SURVEY OF GREAT BRITAIN. 



PART III, 



CONTAINING 



Pages 129 to 176; Plates XV to XXV. 



LONDON : 



PRINTED FOR THE PALiEONTOGRAPHICAL SOCIETY. 



1866 



