﻿VI PREFACE. 



remarkable forms discovered since the first publication of 

 the " Natur ilist's Library" have been added. The wood- 

 cuts have also bjen re-drawn from actual specimens. The 

 Editor ack lowledges with pleasure the pains which Mr. 

 Lydekker has taken to give a full account of the two Orders 

 contained in the present volume, and also the liberality of 

 the publishers in the matter of the illustrations. 



R. BOWDLER SHARPE. 



