PREFACE. 



British Museum, the author is indebted for kindly assistance towards the correct 

 identification of many of the specimens figured. For substantial services in the revision 

 of the proof sheets acknowledgments are especially due to Mr. Robert Bell, M.A. 



The author has, finally, to acknowledge his obligations to Messrs. Waterlow 

 and Sons Limited and their staff of expert departmental managers for the pains- 

 taking and, to himself, eminently satisfactory manner in which they have carried out 

 his views concerning the production of this volume. 



LONDON, 

 February 1st, 1897. 



