The Biology ofBalanus balanoides. II. Algal Infection of the Shell

Abstract
Inwork on the biology ofBalanus balanoides, use has been made of the method of differentiating the successive year groups by the colour of their shells. The present paper describes the method of doing this, and gives a brief account of the infective penetrative algæ which cause the colouration. The first author (M.W.P.) is responsible for the algological observations, and the second (H.B.M.) for the zoological observations.

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