482 

 '4. 



piMAcuLATA. P. witli EH opaquc, oval fhell, of a glofly yellow co- 

 Tab. 13. f. S. lour, and perfe6lly fmooth, with only the rudiment of a 

 vertex at the fmaller end, marked by a tranfverfe, ob- 

 long, black fpot ; another oblong fpot of the fame co- 

 lour near the other end, placed longitudinally : the fhell 

 is convex, but not much elevated. Infide concave, 

 fmooth, gloffy, yellow ; margin thin. Length a quar- 

 ter of an inch ; breadth rather more than one eighth ; 

 height about one fixteenth of an inch. 



We found one of this rare and fingular fpecies at Fal- 

 mouth in Corntvall; and another, in every refpeft the 

 fame, at Milton fands, on the fouth coaft of Devon; 

 ■they were both recent and perfeft fhells, but not alive. 



5. 

 Fluviatilis. Patella fluviatilis. Giiiel Syji. p. 3711. 9S. 



Gualt. t. 4. f. A. A. 



Lijier Conch, t. 141, f. 39. 



Id.AngJ. t. 2. f. 32. 



Da Cojla. p. 1. t. 2. f. 8. S. 



Favan. t. 61. A. 3. 4. 



Schroeter Fliijfconch. t. 5. f. 1.2.; 

 Ancylus fli>viatilis. MuUer Verm. ii. p. 201. No. 386. 

 Patella lacuftris. Br. Zool. No. 149. 



Fult. Cat. Dorfd. p. 51. 



Turt. Lin. iv. p. 577. 



P. with a fub-conic, pellucid, horn-coloured fhell, 

 'tifually covered with a dark-brown, green, or dufky 



epidermis J 



