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

by Charles Darwin

[Plate III., figure 5 b.]

[Plate III., figure 6 a.]

[Plate III., figure 6 b.]

[Plate III., figure 6 c.]