TETRACLITA SQUAMULOSA. Schumacher. Essai d’un Nouveau Syst., &c., 1817.
BALANUS STALACTIFERUS. Lamarck. Animaux sans Vertèbres, 1818.
------ ------------ Chenu. Illust. Conch., Pl. 4, fig. 6, 7.
ASEMUS POROSUS. Ranzani. Memoire di Storia Naturale, Tab. 3, fig. 32-35.
CONIA POROSA. Sowerby. Genera of Recent and Fossil Shells, Plate, 1823.
---- ---- Leach. (sine descript.) Encyclop. Brit. Supplement, vol. 3, 1824, Tab. 57.
[107] As Gmelin and Bruguière published the same year, I do not know which comes first, but I have adopted the best known name. Most authors give, amongst their references, Chemnitz, vol. 8, Tab. 98, fig. 836, 837, but the accompanying description is more applicable to [T. serrata] of this work than to [T. porosa]; without a figure or description, however, of the under side of the scutum it is impossible to decide. Several authors, also, give Lepas cariosa of Pallas, as a synonym; this, however, is the [Balanus cariosus] of this work.
Radii rarely present, when present narrow; even the sutures often absent: shell steeply conical, with the surface generally corroded, and having a stalactiferous appearance.
Var. (1) communis (Pl. [10], fig. [1 a]): outer lamina of shell almost wholly removed; the portion preserved, as well as the exposed parietal tubes, gray, or pale dirty brown, or dull purple.
Var. (2) nigrescens (Pl. [10], fig. [1 c]): outer lamina of shell almost wholly removed; the portion preserved, and the exposed parietal tubes, very dark purple or inky black.