16 '17 



Fig. 35. — 19 specimens of Purpura lapillus L., Great Britain, illustrating variation. 

 (1) Felixstowe, sheltered coast ; (2), (3) Newquay, on veined and coloured rock ; (4), Herm, 

 rather exposed ; (5), Solent, very sheltered ; (0), Land's End, exposed rocks, small food supply ; 

 (7) Scilly, exposed rocks, fair food supply; (S) St. Leonards, flat mussel beds at extreme low water ; 

 (9) Robin Hood's Bay, sheltered under boulders, good food supply; (10) Rhoscollyn, on oyster bed, 

 4-7 fath. (Macandrew); (11) Guernsey, rather exposed rocks ; (12) Estuary of Conway, very shel- 

 tered, abundant food supply ; (13), (14) Robin Hood's Bay, very exposed rocks, poor food supply, 

 (14) sli"-htly monstrous ; (lo), (16), (17), Morthoe, rather exposed rocks, but abundant food supply ; 

 (18) St^Bride's Bay; (19) L. Swilly, sheltered, but small food supply. All from the author's collec- 

 tion, except (10). 



