BALANUS ANGULOSUS. Lamarck (1818), in Chenu, Illust. Conch., Tab. 11, fig. 11.
------ TESSELATUS. Sowerby (!). Mineral Conchology, Tab. 84 (1818).
------ SCOTICUS. Brown. Illust. Conch. Great Britain, Pl. 7, fig. 2, sed non, Pl. 6, fig. 9 et 10 (1827); 2d edit., Pl. 53, fig. 1-3, 22, 23 et Pl. 54, fig. 1-3.
------ GENICULATUS. Conrad. Journal Acad. Philadelphia, vol. 6, part 2, p. 265 (1830), Tab. 11, fig. 16.
------ ---------- Aug. Gould (!). Report on the Invertebrata of Massachussetts, fig. 9 (1841).
Shell white, generally sharply ribbed longitudinally: radii with their summits almost parallel to the basis. Scutum longitudinally striated: tergum with the apex produced and purple.
Var. (a): Walls without longitudinal ribs. Mus. Brit., Cuming, Stutchbury, Jeffreys.
Hab.—South shores of England, Ireland, Scotland, Shetland Islands, Iceland, Davis’s Straits, 66° 30′ N.; Lancaster Sound, 74° 48′ N. (Mr. Sutherland). Maine and Massachussetts, United States. China (?). In deep water, common on shells, crustacea, and rocks, sometimes imbedded in sponges.
Fossil in the glacial deposits of Scotland, Uddevalla, and Canada; in the mammaliferous and Red Crag of England; Mus. Lyell, Sowerby, S. Wood, &c.