fl>alaeontogvapbical Society 1908. 



A MONOGRAPH 



OF THE 



BRITISH CAMBRIAN TRILOBITES. 



BY 



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



st. john's college, Cambridge. 



PART III. 



Pages 49— 64; Plates V. VI. 



LONDON: 



PEINTED FOE THE PAL^ONTOGKAPHICAL SOCIETY. 



1908. 



