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

by Charles Darwin

[Plate XII., figure 1 d.]

[Plate XII., figure 1 e.]

[Plate XII., figure 2 a.]

[Plate XII., figure 2 b.]