138 



SHELL OF FULGUR CAK1CA. 



sert the posterior part of the foot into the sand sufficiently to afford them a 

 strong anchorage against currents. A very soft or a very rocky bottom are 

 equally avoided by them. 



SHELL OF FULGUR CAItlCA. 



The curious egg-cases of these mollusks, to which the names "sea- 

 ruffle" and " sea-necklace" are often given by fishermen, always attract 

 the attention of visitors to the sea-side, who find them cast upon the 



