138 C O N C H O L O G Y. 



there are confiderable numbers that have 



very lively colours; yet, in general, they 



abound with lefs variety than moft other 

 Shells. In fome parts of Ei:gland the 



Limpets have obtained the name of Nipple 



Shells. 



The Limpets from particular charafterS 

 may be divided into three genera, viz. 



1. Whole or entire Limpets (Patella? 

 vertice integro), or that are not perforated 

 or open at top. 



2. Chambered Limpets (Patellae conca- 

 meratse five cavitate Stylo interno donata.) 



3. Pierced or perforated Limpets, Mafks, 

 patellae vertice perforato) or thole that 

 have their tops perforated with a hole 

 pierced quite through the Shell. 



Some authors have made a fourth ge- 

 nus of Limpets, with a twirled, crooked, or 

 produced beak. (Vertice adunco ) But as 



feveral Limpets run much on it, though 



not 



