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

by Charles Darwin

[Plate VII., figure 7 b.]

[Plate VII., figure 7 c.]

[Plate VII., figure 7 d.]

[Plate VII., figure 8 a.]