iv 
PREFACE. 
professionally engaged in collecting, as showing the approved 
manner in which the various objects referred to should be 
treated. 
The various chapters have been written by different members 
of the staff of the Natural History Museum, with the hope 
that the distribution of this work will lead to the formation 
of important collections which will ultimately come to us for 
study and comparison, and possibly enrich the series preserved 
in the Museum. 
E. Kay Lankester, 
Director. 
British Museum (Natural History), 
Cromwell Road, 
London, S.W. 
June 1st, 1902. 
