a
b
c
Sea temperature, O C
F I ~ .
2. Geographical variation in the breeding season of Bolryllua echlosaeri (from data in L’Hardy, 1962 ; Lo Bianco, 1909 ;
Miller, 1952 ; Polk, 1962 ; Sabbadin, 1955). Sea temperatures at a, Naples, b, Millport (Scotland) and c, Venice.
ti
E Go