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 7.]

[Plate XXIII., figure 8.]

[Plate XXIII., figure 9.]

George Sowerby.