A MONOGRAPH 



OP THE 



BEITISH STE0MAT0P0R0IDS. 



BY 



H. ALLEYNE NICHOLSON, M.D., D.Sc., Ph.D., E.G.S., 



EEGIUS PROFESSOR OF NATURAL HISTORY IN THE UXIVERSITT OF ABERDEEN. 



PART II.— DESCRIPTION OF SPECIES. 



Pages 131—158. Plates XII— XIX. 



LONDON: 



PRINTED FOE THE PAL^ONTOGKAPHICAL SOCIETY. 



1889, 



