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PLATE 19. Genera—CHTHAMALUS, CHAMÆSIPHO, AND PACHYLASMA.

A Monograph on the Sub-class Cirripedia (Volume 2 of 2) / The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · Charles Darwin · 第 116 / 136 章