A Monograph on the Sub-class Cirripedia (Volume 2 of 2) / The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.
Charles Darwin
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[Plate XXI., figure 1
b
.]
[Plate XXI., figure 1
c
.]
[Plate XXI., figure 1
d
.]
