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 X., figure 3
c
.]
[Plate X., figure 3
d
.]
George Sowerby.
[
TETRACLITA.
]
Plate XI.
