256 BALANID^E. 



Section D. 



Parietes permeated by pores. Basis and Radii not per 

 meated by pores. 



25. Balanus porcatus. PL 6, fig. 4 a — 4 e. 



Balanus porcatus. Emanuel da Costa. Hist. Nat. Test. Brit., 



p. 249(1778). 

 Lepas balanus. Linn. Sjst. Naturse (1767). 



— — Born. Testacea Mus. Cees. Desc, Tab. 1, fig. 4, 



(1780). 

 __ _ Chemnitz. Syst. Conch., 8 Band., Tab. 97, fig. 820, 



(1785). 

 Balanus abctica patellifobmis. Ellis. Philosoph. Transact., vol. 50, 



Tab. 34, fig. 18 (1758). 



— sulcatus. Bruguiere. Encyclop. Method., Tab. 164, fig. 1 



(1789). 

 Lepas costata and balanus. Donovan. British Shells, 1802-1804, 



Tab. 30, fig. 1, 2. 

 Lepas Scotica. W. Wood. General Conchology, PI. 6, fig. 3, 



sed non Lepas balanus, PI. 7, fig. 3, (1815). 

 Balanus angulosus. Lamarck (1818), in Chenu, Illnst. Conch., 



Tab. 11, fig. 11. 



— tesselatus. Sowerby (!). Mineral Conchology, Tab. 84 



(1818). 



— Scoticus. Brown. Illust. Conch. Great Britain, PI. 7, 



fig. 2, sed non, PI. 6, fig. 9 et 10 (1827); 

 2d edit., PI. 53, fig. 1-3, 22, 23 et PI. 54, 

 fig. 1-3, 



— geniculates. Conrad. Journal Acad. Philadelphia, vol. 6, 



part 2, p. 2G5 (1830), Tab. 11, fig. 16. 



— — Aug. Gould (!). Report on the Inverte- 



brata of Massachusetts, 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. 



