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

by Charles Darwin

[Plate IX., figure 9 b.]

[Plate IX., figure 9 c.]

[Plate IX., figure 9 d.]

George Sowerby.