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

  • Fig. 1 a, Chthamalus intertextus, shell; 1 b, scutum and tergum, calcified together, with the suture obliterated in the upper part, internal view of.
  • 2 a, Chthamalus scabrosus, shell; 2 b, scutum, internal view of; 2 c, tergum, internal view, p, plate forming one side of the cavity in which the depressor muscle is attached; 2 d, tergum, as seen from almost vertically beneath; p, pit for the depressor muscle; q, special pit for the lateral, properly scutal depressor muscle; r, articular furrow.
  • 3 a, Chamæsipho columna, shell; A, rostrum; B, lateral compartment, probably formed by fusion of the rostro-lateral and lateral compartments; E, carina; 3 b, 3 c scutum and tergum, internal views of.

  • 4 a, Chamæsipho scutelliformis, shell much enlarged, seen from above; A, rostrum, separated by imperfect sutures from the (B) lateral compartments, which are formed probably by the fusion of the rostro-lateral and lateral compartments; E, carina; B stands opposite one of the inward folds of the wall, leading into one of the tubular apertures, which runs (generally with an irregular spiral curve) through the whole thickness of the shell down to the surface of attachment. The carina has two of these apertures.
  • 4 b, Chamæsipho scutelliformis, another specimen, seen from the under side, letters of reference the same.
  • 4 c, Chamæsipho scutelliformis, rostrum, disarticulated, enlarged, showing the alæ.
  • 4 d, Chamæsipho scutelliformis, scutum and tergum, internal views of.
  • 5 a, Pachylasma giganteum; 5 b, rostrum of an extremely young specimen, much enlarged, showing its compounded nature, viz., of a true rostrum and rostro-lateral compartments; 5 c, scutum and tergum, external views of; 5 d, scutum and tergum, internal views of.