LEPAS. 75 



number of small grey-brown glossy scales placed in an im- 

 bricate manner, "and concealing the skin : length nearly 

 three quarters of an inch ; breadth about half an inch. 

 Drifted wood : very rare. v. v. 



B. Fixed without stalk, conical, and furnished with an 

 internal lid. Acorn-shell. 8, to 20. 



8. Lepas Diadema. Turban Acorn-shell. 



Lister, pi. 445. f. 238 Da Costa, pi. 17. f. 2 Dono- 

 van, pi. 56. f. 1, 2 JFoorf, pi. 4. 



Shell roundish, hemispherical, a little compressed, with 

 six valves, which with the intermediate spaces form twelve 

 triangular compartments ; the six raised ones with about 

 four strong rounded wrinkled longitudinal ribs, with their 

 pointed ends at the top of the shell j the other six are 

 sunken and finely seriate transversely, with their points at 

 the bottom of the shell : color dirty white or grey, rather 

 polished : the mouth or aperture funnel-shaped and six- 

 sided : the base concave, divided into eighteen striate par- 

 titions, projecting a little within the opening of the shell, 

 and finely toothed : lid membrana^ceous, ending in two 

 valves : diameter at the base about two inches, and half as 

 much in height. 



On the back of whales : rare. v. m. 



9. Lepas Tintinnabulum. Bell Acorn-shell. Fig. 31. 



Lister, pi. 443. f. 285 Donovan, pi. 148 Dorset Cat. 

 pi. 1. f. b.JFood, pi. 6. f. 1, 2. 



Shell more or less conic, a little angular, divided into 

 twelve triangular compartments ; the raised ones finely 

 striate longitudinally, and the sunken ones transversely : 

 lid of four valves, two of them large, strongly striate trans- 

 versely, a longitudinal furrow dividing them from each, 

 other : color dull white, often with a mixture of purple : 

 length nearly two inches ; diameter of the base hardly 

 one. 



On the bottoms of ships ; and in Dublin bay it has been 

 found affixed to the Ostrea opercularis, from which circum- 

 stance it is clearly identified as a British production, v. v. 



H 2 10. Lepas 



