PLATE CXXIX. 



PATELLA ALBIDA. 



WHITISH CHAMBERED PAP-SHELL. 

 GENERIC CHARACTER. 



Animal a Limax : shell univalve, sub-conic without spire. 



SPECIFIC CHARACTER. 



Shell fragile, entire, subrotund, whitish ; vertex somewhat central, 

 and slightly pointed ; lip within lateral. 



Patella albida : testa fragilis integerrima subrotunda albida 

 vertice subcentrali submucronato, labio interio 



laterali. 



This rare and nondescript species of Patella was found on the 

 coast of Cornwall and communicated by the lady who favoured us 

 with Mactra glauca, and Mytilus ungulatus. It differs from any of 

 the described British shells of this genus, in having an inner lip or 

 chamber, such as is observed in several of the exotic kinds, belonging 

 to the first section of the genus inGmelin's arrangement ; " Labiatse 

 s. labio interno instructse, testa Integra." 



It is an exquisitely delicate shell, and remarkably brittle : there is a 

 specimen of this shell in the collection of William Pilkington, Esq; 

 Whitehall. 



