A MONOGRAPH 



OF THE 



BRITISH STE0MAT0P0K0IDS. 



BY 



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



EEGIUS PEOFESSOE OF NATFEAL HISTOET IN THE UNIVEESITY OF ABEEDEEN. 



PART I.— GENERAL INTRODUCTION. 



Pages i— iii, 1—130. Plates I— XI. 



LONDON : 



PRINTED FOR THE PAL^IONTOGRAPHICAL SOCIETY. 



1886. 



