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

by Charles Darwin

[Plate XXVII., figure 5.]

George Sowerby.

NERVOUS SYSTEM.

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Plate XXVIII.

[Plate XXVIII., figure 1 a.]