_Var. nitidus_: with respect to this variety I have little to add to my preliminary remarks on its peculiar appearance, owing to its smooth, naked condition, and pure white or pale purple colour. This colour, when examined through a lens, is seen to consist of very fine longitudinal stripes; and is produced by the calcareous matter within the longitudinal parietal pores being thus coloured. Generally the scuta have two longitudinal furrows; but I have seen a scutum of one perfectly characterised specimen with only a single broad furrow, like that which frequently occurs in the membrane-covered variety. _Var. Coquimbensis_, as before stated, differs only in its greater size: the scutum, in the one specimen examined, had two broad longitudinal furrows; neither it, nor the tergum differed from certain varieties now found on the coast of Chile. 17. BALANUS PERFORATUS. Pl. 5, fig. 1 _a_-1 _d_; Pl. 4, fig. 3 _a_-3 _c_. BALANUS PERFORATUS. _Bruguière._ Encyclop. Meth., 1789, Tab. 164, fig. 12 _infra_. LEPAS ANGUSTA. _Gmelin._ Syst. Naturæ, 1789. ---- ORE ANGUSTIORE. _Chemnitz._ Vol. viii, Tab. 98, fig. 835. BALANUS CORNUBIENSIS CONICO ORE MINORE. _Ellis._ Phil. Trans. vol. 50, 1758, Tab. 34, fig. 16. LEPAS BALANUS ET FISTULOSUS. _Poli._ Test. Siciliæ (1795), Tab. 4, fig. 5, Tab. 6, fig. 1. BALANUS COMMUNIS. _Pulteney._ Dorset Catalogue, 1799. ---- ---- _Montagu._ Test. Brit., 1803. LEPAS ANGUSTATA. _Wood._ General Conchology, 1815, Pl. 6, fig. 5. BALANUS CRANCHII. _Leach_ (!). (_B. Blainvillii_ in Tab.) Encyclop. Brit. Suppl., vol. iii, 1824. ---- ---- _Brown._ Illust. Conch., 1827, Pl. 7, fig. 9, 10, and 2d Edit., Pl. 53, fig. 9-12. ---- PERFORATUS. _Chenu._ Illust. Conch., Tab. 3, fig. 9, Tab. 6, fig. 15.[92] [92] I have very little doubt regarding any of these references: I have no means of ascertaining the priority, within the same year, of Gmelin and Bruguière, but have given it to the latter, as _perforatus_ is much the best known specific name. English conchologists seem generally to suppose that the _B. communis_ of Pulteney and Montagu is the _B. porcatus_ of this work; but I have not the smallest doubt that I have given it rightly as a synonym of the present species; the indistinctness of the compartments, the multitude of fine ridges, the smallness of the orifice, the longitudinal furrow on the terga, the colour, size, and habitat, all given by Pulteney or Montagu, will agree with no other British species. The _Lepas balanus_ of Poli, which is certainly a synonym of our present species, has been erroneously considered by several authors to be the same with the _L. balanoides_ of Poli, which latter undoubtedly is the _B. amphitrite_ of this work.