400 



This fpecies we believe had never been noticed as 

 Britijh, when we were firfl; favoured with it by Colonel 

 George, of Penryn in Cornwall, in 1795, who took it 

 from an oyjler fliell ; and we afterwards found a few 

 others on oy/lers from Hclford harbour, the fame place 

 from which the original came. As far as we have been 

 able to afcertain, it is always attached to thofe fliells, as 

 we have fince taken it fparingly in Salcomb bay in De- 

 rovJJiire : thefe were alive, adhering very clofely to the 

 upper valve. Some are rather more conic than others, 

 but are rarely above a quarter of an inch in height: 

 diameter five eighths of an inch, ufually lefs, having tak- 

 en it of all intermediate fizes, between that and one 

 tenth of an inch. 



Donovan gives his as a produftion of Cornwall. 



It has been received from India, and is a fliell of the 

 Mediterranean Sea. 



11. 

 Fissu2A. Patella Fiffura. Lin Syfl. p. 1261— G/w7. Syfi. p. 372S. 



Martini Conch, i. t. 12. f. 109. 110. 

 Lijler Conch, t. 543. f. 28.—Pctiv. t. 75. 2. 

 Br. Zool. t. 90. f. 152. (number mifplaced) 

 Da Cofta. p. 11. t. 1. f. 4. 

 Pult. Cat. Dorfet. p. 51. 

 Don. By. Shell, i. t. 3. f. 2. 

 Turt. Lin. iv. p. 592. 



r, with 



