192 PORCELLANAD.E. 



v^'hich T have obtained from the Mediten-anean. A simi- 

 lar observation lias already been made respecting Pisa 

 tetraodon, and I have noticed the same difference in several 

 other species. I have, however, lately received a very 

 large specimen from the coast of Cornwall, through the 

 kindness of Mr. Corks of Falmouth, 



