Ipalaeoittograpbical Society 1919. 



A MONOGRAPH 



OF THE 



BRITISH ORDOVICIAN AND SILURIAN 



BELLEROPHONTACEA. 



BY 



F. R. COWPER REEL), M.A., Sc.D. 5 F.G.S. 



PART II. 



Pages 49 — 92, i — viii ; Plates IX — XIII. (Including Title-page and Index.) 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHIOAL SOCIETY. 



July 1921. 



