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

by Charles Darwin

29. [BALANUS] BALANOIDES. Pl. [7], fig. [2 a]-[2 d].

LEPAS BALANOIDES. Linn. Fauna Succica, 1746, et Syst. Naturæ, 1767.

---- -------- O. Fabricius. Fauna Groen., p. 424, 1780.

---- -------- ET CLIVATUS. Montagu (!). Test. Brit., 1803.

BALANUS VULGARIS (?) Da Costa. Hist. Nat. Testacea, Pl. 17, fig. 7, 1778.

------ OVULARIS ET ELONGATUS. Aug. Gould (!). Report, Invertebrata of Massachussetts, figs. 7 and 8, (1841).

------ PUNCTATUS, CYLINDRICUS, ELONGATUS, FISTULOSUS CLAVATUS. Auctorum variorum. Sed non B. punctatus, Bruguière, Encyclop. Method., et non B. punctatus, Montagu, Test. Brit.

Parietes either solid, or cancellated, or rarely formed by a single row of pores. Tergum, with the spur bluntly or sharply pointed.

Var. (a) with the parietes permeated by tubes; spur of tergum sharply pointed; segments in the posterior pairs of cirri, bearing from eight to ten pairs of spines.

Habitat.—Great Britain, France, Norway, Shetland Islands; Greenland, according to O. Fabricius; North America, in lat. 66° 34′ N.; Labrador; Nova Scotia; Massachussetts, Delaware. Extremely common, attached to rocks, shells, and wood, within the tidal limits.