(sect, c), balanus perforatus. 231 



which frequently occurs in the membrane-covered variety. Far. 

 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. PI. 5, fig. la — 1 d; PI. 4, 



fig. 3 a— 3 c. 



Bala.nus perforatus. Bruguwre. Encyclop. Meth., 1789, Tab. 164, 



fig. 12 infra. 

 Lepas angusta. Gmelin. Syst. Naturae, 1789. 



— ore angustioPvE. Chemnitz. Vol. viii, Tab. 98, fig. 835. 

 Balanus cornubiensis conico ore minoke. Ellis. Phil. Trans. 



vol. 50, 1758, Tab. 34, fig. 16. 

 Lepas balanus et fistulosus. Poli. Test. Siciliee (1795), Tab. 4, 



fig. 5, Tab. 6, fig. 1. 

 Balanus communis. Bulteney. Dorset Catalogue, 1799. 



— — Montagu. Test. Brit., 1803. 



Lepas angustata. Wood. General Conchology, 1815, PI. 6, fig. 5. 

 Balanus cranchii. Leach (!). (B. Blainvillii in Tab.) Eucyclop. 



Brit. Suppl, vol.Jii, 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, 



fisr. 15.* 



-\3' 



Shell pale purple, or white, or dirty ash-colour; smooth, 

 or ', from being corroded, finely ribbed longitudinally ; sheath 

 purple ; orifice generally small ; radii generally narrow or 

 absent. Scutum, internally, with a short minute ridge, 

 parallel and close under the prominent adductor ridge. Ter- 

 gum with the apex somewhat produced. 



* 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 

 Bruguiere, 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. 



