LEPAS. 57 



WART-SHAPED ACORN. 

 PI. 9. /. 5. Mr. Gibbs. 



29. Lepas Verruca. L. testa quadrivalvi, depressiuscula, operculis 



indistinctis plicatis, valvulis intertdvtis striatis. 

 Shell of four valves, somewhat depressed, operculum obscure and 



pleated ; valves interlaced and striated. 

 Lepas Verruca. Linn. Gmel. p. 3212. 

 Balanus, testa depressa oblique lamelloso-striata, apertura subquadrata, 



operculo bivalvi. Brug. Encycl. Meth. Hist. Nat. torn. 6. p. 169. 

 Spengl. Schr. Berl. Naturf. 1. pi. 5. f. 1, 2, 3, 5. Da Costa, Brit. 



Conch, p. 250. Penn. Brit. Zool. ed. 1812. 4. pi. 41. Chem. Conch. 



8. pi. 9S. f. 834. Eneyclop. Method, pi. 164. f. 16, 17. Donov. 



Brit. Shells, pi. 36. f. 1. Mont. Test. Brit. p. 12. Linn. Trans. 8. 



p. 26. 



A compressed subcorneal shell, greatly resembling a 

 wart, and very unlike every other species of the genus. 

 The valves are strongly ribbed and interlace with each 

 other ; aperture oblique and closed by an operculum, 

 which, according to Bruguiere, is of two valves, but so 

 obscure as not to be distinguished except in live shells. 

 It is a very small species, being seldom more than a 

 quarter of an inch in diameter; was first noticed as 

 British, by Pennant; and is found on shells, stones, and 

 other substances. It has also been brought from Ice- 

 land, and from Cape Horn. 



Bruguiere describes this shell as having three valves 

 only, but Mr. George Sowerby has examined the species 

 with great attention, and discovered a fourth valve 

 which escaped the notice of the French Naturalist. 

 These valves are represented in pi. 9, surrounding the 

 principal figure. 



