The inclusion of the Hattock among the species figured 

 (viz, Plate viii,), was due to the wish of the author to illustrate 

 this species. 



. It was afterguards found that no specimen of the Hattock 

 exists in any museum in this country, but this fact Nvas 

 unfortunately not discovered till after the letterpress had been 

 printed off. 



Subscribers are, therefore, requested to mike the following 

 alterations in their copies : — 



On page 78 delete Plate VII I. 



8r for Plate IX. read Plate VIIL 



