7& LEPAS. 



Shell tubular, elongated, slender at the "base and grow- 

 ing thicker towards the top but a little contracted at the 

 aperture, striate longitudinally, rough and sometimes tu- 

 bercled : valves six, three wide and three narrow, wrinkled 

 longitudinally and faintly striate transversely : aperture 

 Wide and gaping ; lid obtuse, of tour valves, obliquely stri- 

 ate : color white, with more or less of a greenish cast : 

 length from one to two inches ; diameter at the base not a 

 quarter of an inch. 



Weymouth, Tenby, and the West of Ireland : rare. v. v. 



17. Lepas pqrtctata. Punctured Acorn-shell. 



Montagu, pi. }. f. 5 Dorset Cat. pi. 1. f. 10. 



Lepas cornubiensis. Pennant, pi. 40. f. 3. 



Shell very rugged, dull brown, with obtuse longitudinal 

 and somewhat undulate ribs, a little spread at the base, 

 generally covered with minute black punctures : lid of four 

 valves, mostly punctured all over ; the upper-ones with a 

 few longitudinal ridges, and near the top on the outer edge 

 of each is a deep notch or groove, giving them a cruciate 

 appearance : length about r <* quarter of an inch 5 breadth 

 more than half as much. 



Lepas convexula. Pennant, pi. 38, middle fig. The 

 young shell. 



We have examined this shell in all, its stages of growth, 

 and perceive that in its~very young state it exactly answers 

 to the description given by Mr. Pennant, v. v. 



18. Lepas costata. Ribbed Acorn-shell. 



Donovan, pi. 30. f. 2. Balanus. 



Shell' white, somewhat conic, nearly closed at the top 

 and rather spreading at the base, with numerous nearly 

 equidistant strong rounded ribs radiating from the top to 

 the base : diarrjeter about half an inch. 



Western coasts of England, Wales, and Ireland : on 

 shells, v. v. 



19. Lepas spongiosa. Sponge Acorn-shell. 



Montagu, pi. !/ f. 4, 5, 6. 



Shell oval, with six angular wrinkled valves, covered 

 with small spines, the summits of the valves much raised 



and 



