﻿A MONOGRAPH 



OF THE 



BRITISH STE0MAT0P0R0IDS. 



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



EEGirs PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF ABERDEEN. 



LONDON: 



PRINTED FOE THE PALJEONTO GRAPHICAL SOCIETY. 



1886—1892. 



