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

by Charles Darwin

[Plate XXIII., figure 3.]

[Plate XXIII., figure 4.]

[Plate XXIII., figure 5.]

[Plate XXIII., figure 6.]