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 Mollusca, with a Map of the 

 Marine and Terrestrial Provinces ; a chapter on the distribution 

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

 serving Land, Presh-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 

 who have assisted him by advice, and the loan of specimens ; 

 also to ]\Ir. Van Voorst, for permission to copy some interesting 

 figures from the " British Mollusca ;" 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 

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

 illustrate these pages. 



