Ipalaeontoovapbical Society 1912. 



A MONOGRAPH 



OF THE 



BRITISH CAMBRIAN TRILOBITES. 



PHILIP LAKE, M.A., F.G.S. 



ST. JOHN'S COLLEGE, CAMBRIDGE. 



PART IV. 



Pages 65—88 ; Plates VII— X. 



LONDON: 

 PRINTED FOR THE PALHONTOGEA PHIC AL SOCIETY. 



February, 1913. 



