PLATE LIII. 



Both Pennant and Da Costa note this as a very rare British species. 

 The first says it is found at Red Wharf, Anglesea, in North Wales ; 

 the latter received it from Christchurch, in Hampshire. 



We have found it on the shores of Glamorganshire, and also in 

 abundance in the sandy bay of Caermarthen this summer. 



