J// 
PREFACE. 
Owrne to failing health Mr. F. E. Edwards was unable to continue his Monograph 
of the Eocene Gasteropoda after the year 1860, but with the facilities afforded by 
specimens from his Cabinet I was enabled to produce some instalments of the 
Monograph of the Bivalvia in the years 1864 and 1871. Mr. Edwards’ death took place 
in 1875, and terminated the possibility of any further prosecution of the work by him, 
his Collection having gone to the British Museum some years previously. I essayed, how- 
ever, to make some progress with both portions of the work, and the solitary Plate of 
the Gasteropoda now given was in consequence engraved. I found, however, that 
owing to advanced years and other circumstances I was unable to carry out my wish, 
and have been compelled to relinquish it with the solitary Plate referred to. 
SEARLES V. WOOD. 
Isr NovemeBer, 1876. 
b 
