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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 267: PLATE 14. Genera—CREUSIA AND CHELONOBIA.
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 14.
Genera—CREUSIA AND CHELONOBIA.

  • Fig. 6 i, 6 k, 6 l, Creusia spinulosa, var. 4, 6 i, tergum, external view; 6 k, the same, from another individual; 6 l, the same, internal view.
  • 6 m, Creusia spinulosa, var. 5, tergum, external view.
  • 6 n, 6 o, 6 p, 6 q, Creusia spinulosa, var. 6, 6 n, scutum, external view of; 6 o, tergum of same individual, external view of; 6 p, scutum of another individual, external view of; 6 q, tergum of latter, external view of.
  • 6 r, Creusia spinulosa, var. 7, scutum, internal view of.
  • 6 s, Creusia spinulosa, var. 9, scutum and tergum, calcified together, external view.
  • 6 t, Creusia spinulosa, var. 10, scutum and tergum, calcified together, external view.
  • 6 U, Creusia spinulosa, var. 11, shell seen from above; 6 u, scutum and tergum, calcified together, external view.
  • Fig. 1 a, Chelonobia testudinaria, shell seen from above; a specimen has been chosen, with some of the radii smooth, and others more or less notched; 1 b, scutum, internal view of; 1 c, tergum, internal view of; 1 d, scutum and tergum, joined together, external view of.
  • 2, Chelonobia caretta, shell seen from above.
  • 3 a, Chelonobia patula, shell seen from above; 3 b, tergum, external view of.
  • 4, Carina of Chelonobia patula, seen from within; a a, outer lamina of wall, joined by the longitudinal septa to b, the inner lamina; e c e, sheath, descending to the base of shell, with the middle part largely hollowed out; the upper part of the sheath, above d d, is transversely marked by the lines of attachment of the opercular membrane; d, d, alæ.
  • 5, View of the edge of the radius of the rostrum of Chelonobia testudinaria.
  • a, a, inner portion of radius.
  • b, thick outer lamina of the radius, transversely pitted; beneath this pitted portion, which forms only the outer surface of the radius, and distinct from the inner portion a, the arborescent and dentated sutural edges of this outer lamina are seen.

  • c, outer lamina of wall of compartment.
  • d, the exterior septum, connecting the outer lamina of the wall to the inner lamina; the basal edge of the inner lamina of the wall is seen beneath and without the lower end of the inner portion (a) of the radius.