首页 / 官方藏书 / A Monograph on the Sub-class Cirripedia (Volume 2 of 2) / The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. / 20. BALANUS PŒCILUS. Pl. 5, fig. 3 a, 3 b.

20. BALANUS PŒCILUS. Pl. 5, fig. 3 a, 3 b.

A Monograph on the Sub-class Cirripedia (Volume 2 of 2) / The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · Charles Darwin · 第 33 / 136 章