4/7 



ed ; and are rarely indented, or angulated at the edges, 

 or only faintly fo. Thefe too are always, when alive, 

 of a horn-colour within, and not white or brown like 

 the others : but whether they are really diftincl is not 

 eafy to determine. Both inhabit all our rocky fliores 

 in vaft abundance; the largeft we ever faw were on the 

 rocks at Marazion in Cornxoall of the conic kind : feme 

 of which were near two inches and a half long, two 

 broad ; and an inch and a half in height. 



We have alfo found the deprefTed ones two inches in 

 length, by one and three-quarters broad; and not above 

 three-q'jarters of an inch in height; with the ribs ex- 

 ceedingly ftrong, and angulated at the margin. 



2. 

 Patella pellucida. Lin. Syji. p. 1260. Pellucida» 



G:)ieL Syft. p. 3717. 133. 



Chem. Conch, x. t. 168. f. 1620. 21. 



Don. Br. Shells, i. t. 3. f. 1. 



Lijier Conch, t. 542. 543. f. 26. 27. 



Id. Angl. Jpp. p. 33. t. 2. f. 10. 



Br. Zool. t. 90. f. 150. 



Pult. Cat. Dorfet. p. 51. 



Borlafe Cornwall t. 28. f. 1.2. 



Turt. Lin. iv. p. 582.—Petiv. t. 75. f.3. 

 Patella coeruleata. Da Cojia. p. 7. t. 1. f. 5. 6. 

 Patella laevis, 5r. Z^oo/ t. 90. bottom fig. without number 

 Patella intorta. Id. t. 90. f 143. 

 Patella caerulea. Gmel. SyJi. p. 3697. 24. 



P. with 



