INTRODUCTION. xi 



Limpets may ]>e found in every har- 

 bour, on every rock, and on every coast: 

 the sea seldom ebbs without leaving shells 

 of various species ; among the most com- 

 mon that are exposed for sale in the 

 markets of the countries the traveller 

 may visit, the connoisseur might disco- 

 ver some rare or interesting varieties. 



I SHALL conclude my observations up- 



smal>j floats in the water, and attaches itself 

 to the bottoms of ships, (if of wood), which it 

 almost immediatelyplerces, and, like the pholas, 

 grows and becomes larger as it penetrates. 



