46 LEPAS. 



PUNCTURED ACORN. 



13. Lepas punctata. L. testa conica, truncata punctata; operculis 



obtusis. Linn. Trans. 8. p. 24. 

 Shell conical, truncated, and punctured ; operculum obtuse. 

 Balanus punctatus. Pultn. in Hutch. Dorset, p. 25. t. 1. f. 10. Mont. 



Test. Brit. p. 8. t. 1. f. 5. 



This is described by Mr. Montagu as a distinct 

 species, that may be readily known by its dull brown 

 colour, by its rugose appearance, and especially by the 

 operculum, which is punctured like a thimble. He 

 observed it in abundance on the south coast of Devon* 

 shire, clustered on the Patella vulgata, and on the rocks 

 near high water mark. Dr. Pulteney, who doubts its 

 specific distinction, says that it differs from the large 

 and most perfect specimens of the common acorn only 

 by being punctured like a thimble. 



The L. cornubiensis, of Pennant, is probably this shell. 



RIBBED ACORN. 



14. Lepas costata. L. testa subconica; operculis acutis. Donov. Br. 



Shells, t. 30. f. 2. 

 Shell somewhat conic : operculum sharp pointed. 

 Mont. Test. Brit. p. 11. Linn. Trans. 8. p. 24. 



A very pretty species of a white colour, and about 

 half an inch in diameter. The valves are indistinct. It 

 has elevated ribs diverging regularly from the aperture 

 to the base, and was discovered by the late Mr. Adams, 

 adhering to some pieces of broken rock on the coast of 

 Pembrokeshire. 





