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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 266: PLATE 13. Genera—PYRGOMA AND CREUSIA.
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 13.
Genera—PYRGOMA AND CREUSIA.

  • Fig. 1 a, Pyrgoma grande; 1 b, scutum and tergum, calcified together, external view of; 1 c, scutum and tergum, internal view of; 1 d, the two scuta and terga, external view, seen from above, having their natural position, when closed.
  • 2 a, Pyrgoma milleporæ, shell viewed from above; 2 b, internal view of, showing the sheath; 2 c, scutum and tergum, united, external view of; 2 d, scutum, var. external view of; 2 e, scutum, internal view of; 2 f, tergum, internal view of.
  • 3 a, Pyrgoma dentatum shell, external view of; 3 b, scutum, var. 1, external view of; 3 c, tergum, var. 1, external view of; 3 d, tergum, var. 2, external view of; 3 e, scutum, var. 3, external view of; 3 f, tergum, var. 3, external view of; 3 g, scutum and tergum, var. 1, joined together, internal view of.
  • 4 a, Pyrgoma crenatum, scutum, external view of, showing the great depending adductor plate and large occludent ledge; 4 b, external view of.
  • 5 a, Pyrgoma monticulariæ, external view of; 5 b, another specimen, internal view of; 5 c, another specimen, external view of; 5 d, portion of circumference of shell, viewed externally, much magnified, showing the outer lamina, and the irregular, longitudinal septa; 5 e, another specimen of the same, with the longitudinal septa more regular; 5 f, scutum and tergum completely calcified together, external view of.