P E E I A C E. 



I HAVE again been indebted to Captain Savile G. Reid for his 

 assistance in the preparation of the present volume, and for 

 the additions which he has made to Mr. Gates' original MSS. The 

 valuable collections which the Museum has received during the 

 past two years have greatly added to the importance of the 

 present volume. The donations of Mr. "W. Radcliffe Saunders and 

 Mr. C. B. Rickett have been especially valuable. 



E. RAY LANKESTER, 



Director. 



British Museum (Natural History), 

 February 22, 1905. 



418490 



