NOTICE. 



THE second part of this Manual is now in preparation, and 

 will be published early in the summer. It will contain an ac- 

 count of the remaining orders of shell-fish: a chapter on the 

 Geographical Distribution of the MoUusca, with a Map of the 

 Marine and Terrestrial Provinces ; a chapter on the distribution 

 Fossil Shells ; another on the methods of collecting and pre- 

 serving Land, Fresh-water, and Sea-shells ; the Preface ; and an 

 Index of the genera and technical terms . 



The writer desires to acknowledge his obligations to Mr. 

 Hugh Gumming. Professor Edward Forbes, and other gentlemen 

 vho have assisted him by advice, and the loan of specimens : 

 dso to Mr. Tan Voorst, for permission to copy some interesting 

 igures from the " British MoUusca : ?J and his thanks are most 

 especially due to Mr. John Edward Gray, Keeper of the Zoolo- 

 gical Department of the British Museum, for access to his library 



cabinet, and the use of some of the best engravings which 

 llustrate these pages. 



