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

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

Chapter 271: PLATE 18. Genus—CHTHAMALUS.
By Charles Darwin
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This work presents a detailed monograph on the sub-class Cirripedia, focusing on various species of barnacles, including the Balanidæ and Verrucidæ. It includes comprehensive descriptions, classifications, and illustrations of these organisms, contributing to the understanding of their biology and taxonomy. The author examines their anatomical features, reproductive habits, and ecological roles, providing insights into their adaptation and evolution. The text serves as a significant resource for naturalists and biologists interested in crustacean studies, reflecting the author's meticulous research and dedication to the field.

PLATE 18.
Genus—CHTHAMALUS.

  • Fig. 1 a, Chthamalus stellatus, shell, var. a (communis).
  • 1 b,”””” e (depressus).
  • 1 c,”””” c (communis).
  • 1 d,”””” d (fragilis).
  • 1 e,””scutum and tergum, viewed inside, var. c, British.
  • 1 f,””scutum and tergum, viewed inside, var. a, Madeira.
  • 1 g,””scutum and tergum, viewed inside, var. e, Mediterranean.
  • 1 h,””scutum and tergum, viewed inside, var. c and e, St. Jago, Cape de Verde Arch.
  • 2, Chthamalus antennatus, shell.
  • 3 a, Chthamalus dentatus, shell; 3 b, var. shell, attached to a ship’s bottom; 3 c, tergum, viewed from within.
  • 4 a, Chthamalus cirratus, scutum, viewed on inside; 4 b, tergum, viewed on inside.
  • 5 a, Chthamalus Hembeli, shell, old specimen.
  • 5 b, Chthamalus Hembeli, younger shell; C, carino-lateral compartment; a′, ala; d, radius; E, carina; a′, the two alæ.
  • 5 c, Chthamalus Hembeli, scutum, external view of; 5 d, tergum, external view of; e, two of the crests, to which the tergal depressor muscles are attached, much enlarged and viewed from vertically beneath, showing the lateral denticuli or sub-crests.
  • 6 a, Chthamalus fissus, shell; 6 b, scutum and tergum, separated, internal views of.