LEPAS. 
n 
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 four valves, obliquely stiv: 
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. i\ 
17. Lepas punctata. Punctured Acorn-shcll. 
Montagu, pi. 1. f. 5 — Dorset Cat. pi. 1. f. 10. 
Lepas cornubiensis. Pennant , pi. 40. f. 3. 
Shell very rugged, dull brown, with obtuse longitudinal 
*md 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 a quarter of an inch ; 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 grov.lh, | 
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 
tlie base : diameter about half an inch. 
Western coasts of England, Wales, and Ireland: on 
shells, v,v. 
1.9. Lepas spongiosa. Sponge Acorn-shell. 
Montagu, pi. 17. f. 4, 5, G. 
Shell oval, with six angular wrinkled valves, covered 
>yith 3 mall spines, the summits Gf the valves much raised 
and 
