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

by Charles Darwin

[Plate XX., figure 4 e.]

George Sowerby.

[PACHYLASMA] : [OCTOMERIS] : [CATOPHRAGMUS] .

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Plate XXI.

[Plate XXI., figure 1 a.]