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



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

 rather exposed; (5) Solent, very sheltered; (6) Land's End, exposed rocks, small food supply; 

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

 (9) Uobin Hood's Hay, sheltered under boulders, <;ood food supply ; (10) KhoscoUyn, on oyster bed, 

 4-7 fath. (Macandrew) ; (11) (ruernsey, rather exposed rocks ; (V2) Estuary of Conway, very shel- 

 tered, abundant food supply; (18), (14) liobin Hood's Bay, very exposed rocks, poor food supply: 



(14) slifi^htlv monstrous ; (IT)), (!(>), (17) Morthoe, rather exposed rocks, but abundant food supplv ; 



(15) St. Bride's Bay ; (HI) L. Swilly, sheltered, but snuill food .supply. All from the author's collec- 

 tion, except (10). 



