2 NOTE TO THE CRAG MOLLUSCA. 



other, and this is the state and condition of the specimens of my little Crag fossil, 

 the correct position of which I had been unable to determine ; the figure, therefore 

 (fig. 24, PI. XXXI) will serve as an illustration of the under valve of what probably 

 was the young state of the Crag A. ephippium. 



There is every reason to believe that the Genus Aplysia existed during the Tertiary 

 Period, but as yet it appears we have no well-attested specimens of their remains 

 having been preserved in a fossil state. 



S. V. WOOD. 



May, 1860. 



