Fig. 35. — 19 specimens of Pwpura lapillas L., Great Britain, illustrating variation. 



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

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

 (T) Scilly, exposed i-ocks. foir food supply ; (S) St. Leonards, fiat mussel beds at extreme low water; 

 (9) liobin Hood's Bay, sheltered under boulders, -rood food supplv; (10) Ehoscollvn, on ovster bed, 

 4-7 fath. (^racandrew) ; (11) Guernsey, rather exposed rocks ; (12) Estnarv of Conwav, "verv shel- 

 tered, abundant food supply; (13), (14) Robin Hood's Bav, verv exposed rocks, poor food supplv: 



(14) slisjThtly monstrous; (1.5), (Ifi), (IT) ^lorthoe, rather exposed rock^ hut abundant food supplv; 



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

 tion, except (10). 



