A Monograph on the Sub-class Cirripedia (Volume 2 of 2) / The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.

by Charles Darwin

[Plate XXVIII., figure 1 b.]

[Plate XXVIII., figure 1 c.]

[Plate XXVIII., figure 2.]