480 



it is occafionally feen on the broad bottom part of the 

 leaf, while the plant is growing on the rocks. We have 

 - found the young in clufters on the leaves, but rarely 

 on the ftalks, though fometimes on the roots. 



S. 



Parva. Patella parva. Da Cofla p. 7. t. S. f. 11. 



Don Br. Shells i. t. 21. f. 2. 

 Turt. Lin. iv. p. 592. 



P. with a thin, fub-pellucid, fub-conic, oval fhell, of 

 a blueifli-grey, and fometimes horn-colour, tinged with 

 purple; but ufually covered wnth a dark epidermii, or 

 extraneous matter, that obfcures the fhell ; it is obfoletely 

 llriated longitudinally, wrinkled circularly, and elegant- 

 ly marked with purplifh-red lines, radiating from the 

 apex to the margin ; in fome thefe lines are broad, in 

 others narrow and undulated, running into each other 

 like the links of a chain; fometimes only vifible at the 

 margin, and always mod conipicuous in the infide : ver- 

 tex placed neareft to one end, pointed, reflefted, but 

 not curved. Infide fmooth, glolfy, of a purplifh hue. 

 Dead {hells become white, and lofe all their markings, 

 except two lines immediately above the beak, which join 

 and form the fliape of a V. Length three-eighths of an 

 inch; breadth two-eighths ; height not quite fo much: 

 rarely half ai: inch long. 



Da Costa feems to be the firft author that defcribed 

 this {hell; and fmce by Mr. Donovan: the former, 



however. 



