A MONOGEAPH 



OF 



BRITISH TRILOBITES. 



BY 



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



LATE OF THE GEOLOGICAL SURVEY OF GREAT BRITAIN. 



PART IV, 



CONTAINING 



Pages 177 to 216; Plates XXV* to XXX. 



LONDON : 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 

 1867. 



