VI PREFACE 



the book may fall, appendices have been added containing 

 lists and brief diagnoses of the non-marine relatives of the 

 animals dealt with in the several chapters. These lists 

 have been confined to British species, but are not of equal 

 range in all cases, for reasons which will be apparent to 

 those acquainted with the groups. While a personal 

 knowledge of anatomy will, no doubt, enable the reader 

 more fully to appreciate the facts that are mentioned, 

 I have attempted to make the accounts of the various 

 animals intelligible and interesting to those who have not 

 the advantage of technical knowledge. 



In addition to those to whom acknowledgments of 

 kind assistance are made in the text, I must express my 

 thanks to Mr M. D. Hill, of Eton College, for reading the 

 proofs and for numerous helpful suggestions, to my former 

 pupil Mr Edgar Schuster, of New College, Oxford, for 

 valuable help in consulting the literature of the subject, 

 and to Mr A. E. Shipley, of Christ's College, Cam- 

 bridge, for permission to use a large number of the 

 plates that appear in Shipley and MacBride's Zoology, 

 and for frequent advice and help in the course of the 

 preparation of the book. I am also much indebted to 

 Mr Edwin Wilson for the skill and care which he has 

 bestowed upon my original drawings, figs. 15, 16, 20, 34, 

 35, 36, 37 and 38, in preparing them for reproduction. 



0. H. L. 



CHARTERHOUSE, 

 GODALMING. 



April 1904. 



