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 XI., figure 4
b
.]
[Plate XI., figure 4
c
.]
[Plate XI., figure 4
d
.]
[Plate XI., figure 5
a
.]
