EXPLANATION? ©F =< PiZAd E *1Ve 
Purpura lapillus 1., illustrating variation. 
. I.—Felixstowe, sheltered coast. 
2, 3.—Newquay, on veined and coloured rock. 
4.—Herm, rather exposed. 
5.—sSolent, very sheltered. 
6.—Land’s End, exposed rocks, small food supply. 
7.-—Scilly, exposed rocks, fair food supply. 
8.—St. Leonard’s, flat mussel beds at extreme low water. 
g.—Robin Hood’s Bay, sheltered under boulders, good 
food supply. 
10.—Rhoscollyn, an oyster bed, 4—7 faths. (Macandrew). 
11.—Guernsey, rather exposed rocks. 
12..—Conway Estuary, very sheltered, abundant food supply. 
13, 14.—Robin Hood’s Bay, very exposed rocks, poor food 
supply. 
15, 16, 17.—Morthoe, rather exposed rocks, abundant food 
supply. 
18.—St. Bride’s Bay. 
19.—Lough Swilly, sheltered but small food supply. 
(Reproduced from the ‘Cambridge Natural History.’) 
