PEEFACE 



THE manuscript of Dr. Pelseneer's volume on the Mollusca 

 now published was completed nearly two years ago. It has 

 been translated and revised for press by Dr. Gilbert Bourne, 

 of New College, Oxford, to whom the thanks of both the 

 author and editor are due and are cordially tendered. 



E. KAY LANKESTEK. 



December 1905. 



