LEPA9. 77 



13. Lepas conoides. Conic Acorn-shell. 

 Donovan, pi. 30. f. 3 Dorset Cat. pi. 2. f. 9. 



Shell conic, with the aperture very narrow, of six un- 

 equal valves, surrounded with numerous nearly equidistant 

 thia raised striae from the bottom to the top ; the tip of the 

 valves rather fiat and rounded : aperture narrow ; the lid of 

 tbur valves : coloi- purplish- white : diameter not half an 



Western coasts, on shells and stones. . v. 



14. Lepas Balanus. Common Acorn-shell. 



Lister, pi. 443. f. 236 Pennant, pi. 40. f. I Donovan, 

 pi. 30. f. 1 Wood, pi. 7. f. 3 Dorset Cat. pi. 2. f. 12. 



Shell of six raised valves, rugged at their edges, more or 

 less ribbed longitudinally, spreading at the base, of a grey- 

 ish-brown or purplish color; the depressed triangles striate 

 or rugged transversely : aperture moderately large : lid of 

 four valves, all of them striate transversely ; the shorter or 

 front pair often smooth at the top, and serrate or tubercled 

 by the striae down the outer margin ; the back pair longer, 

 curving over the others, with a longitudinal groove down 

 the middle of each : length nearly an inch ; breadth at the 

 base about half as much. 



Rocks, piles, and other substances, v. v. 



15. Lepas balanoides. Smooth Acorn-shell 



Lister, pi. 444. f. 287 Pennant, pi. 40. f. 2 Donovan, 

 pi. 36. f. 2 Da Costa, pi. 17- f. 7 Wood, pi. 7- f. 1 

 Dorset Cat. pi. 2. f. 7. 



Shell white, smooth, often deeply grooved at the base : 

 valves six, mostly directed one way and ending in a beak, 

 divided by a longitudinal furrow : lid of four valves ; the 

 two upper ones slightly striate transversely ; the others 

 quite smooth : about half the size of the former, and often 

 much spread at the base. 



Rocks, and other substances, v. v. 



16. Lepas elongata. Club-shaped Acorn-shell. 

 Pennant, pi. 40. f. 4 Donovan, pi. 36. f. 3 Dorset Cat. 

 pl.l.f.6. 

 Lepas clavata. Wood, pi. 7- f. 2. 



H'3. jShclI 



