Ipateontograpbical Society 1917. 



A MONOGRAPH 



OF THE 



BRITISH CAMBRIAN TRILOBITES. 



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



st. john's college, Cambridge. 



PART V. 



Pages 89—120 ;" Plates XI— XIV. 



LONDON: 



PRINTED FOE THE PAL^ONTOGRA PHIC AL SOCIETY. 



April, 1919. 



