CIRBHOPODA. 121 



of six projecting pieces, separated by as many depressed ones, three of 

 which are narrower than the others. Their base is usually formed of 

 a calcareous lamina, and fixed to various bodies. The four valves of 

 their operculum close the orifice exactly. 



The rocks, shells, &c., on the coast of Europe, are, in a man- 

 ner, covered with a species of Balanus, the Lepas balanus, L., 

 Chemn., VIII, xcvii, 826 *. Naturalists have separated from it 



The AcAST^, Leach, whose base is irregular, convex towards the 

 exterior, and which does not become fixed ; most of them are found 

 in sponge |, 



The CoNi^, Blainv., the tube of which has but four salient pieces J, 



The AsEM^, Ranzani, where the tube has no decidedly salient 

 pieces §, 



The Pyrgom^e, Savigny, whose tubular position, forming a strongly 

 depressed cone, has but a very small orifice, almost like the shell of 

 a Fissurella ||, 



The OcTHosi^, Ranzani, which have but three salient pieces in the 

 tube, and only two valves to the operculum^. 



The Creusi^, Leach, with four salient pieces, and two valves to 

 the operculum**. 



M. de Lamarck, under the name of Coronul*, separates the very 

 wide species, where the parietes of the cone are occupied, by cells so 

 large, that they resemble chambers ff; and under that of 



TuBiciNELLiE, those in which the tubular portion is elevated, 

 narrower near the base, and divided into annuli, which mark its 

 growth \\. 



There are some species of these last two subgenera, which affix 

 themselves to the skin of the Balaenae, and even penetrate into their 

 blubber. 



To the preceding subgenera must be added the 



* Add, Lepcts baluno'ides, Chemn., VIII, xcvii, 821 — 825 ; — L. tintinnahuhim . lb, 

 823 — 831; — L, minor, lb. 827; — L. porosa, Id., xcviii, 836; — L. verruca, lb., 

 840, 841 ; — L. angusta, lb., 835 ; — L. elongafa, lb., 838; — L. patellaris, lb., 839 ; 

 — L. spinosa, lb., S40 ; — L. violacea, Id., xcix, 842 ; — L. tulipa, Ascan. Icon., X ; — 

 L. cylindrica, Gionov., Zooph., XIX, 3, 4 ; — L. cariosa, PaU. Nov. Act. Petrop., 

 II, vi. 24, A, B. 



f Acasfu Montugui, Leach, Edinb. Encyc, copied Blainv., Malac, Ixxxv, 3 ; — 

 Lepas spongites, Poli, I, vi, 5. 



X Conia ratliata, Blainv., Malac, Ixxxv, 5. 



§ Lepas porosus, Gm., Chemn., VIII, xcviii, 836, 837, Encyc. Method., pi. 165, 

 f. 9, 10. 



II Pyrgoma cancellala, Leach, loc. cit., copied Blainv., Malac. Ixxxv, 5. 



^ Lepas Stroemii, Miill., Zool. Dan., Ill, xciv, 1 — 4. 



** Creusia spinulusa. Leach, loc. cit., copied Blainv., Malac, Ixxxv, G. 



tt Lepas balcenaris, L., Chemn., VIII, xcix, 845, 846; — L. testudinarius, lb., 

 847, 848, which attaches itself to the shell of Tortoises. 



JJ The TubicineUa, Lam., Ann. du Mus., I, xxx, 1, 2. 



