A MONOGRAPH 



BEITISH STB0MAT0P0R0IDS. 



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



REGIUS PHOFE380E OF NATURAL HISTORY IN THE UNIVERSITY OF ABERDEEN. 



PART III.— DESCRIPTION OF SPECIES. 



Paoes 159—202 : Plates XX— XXV. 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 

 1891. 



