vi THE LIFE OF THE MOLLUSCA 
to reproduce illustrations from their publications or 
taken from specimens on exhibition in the Natural 
History Museum. Other illustrations have been 
kindly lent by Mr. W. M. Webb, F.L.S. 
To his colleagues in the Natural History Museum, 
Mr. E. A. Smith, 1.S.0., and Mr. G. C. Crick, the 
author is indebted for valuable assistance in regard 
to points of nomenclature. 
