UNIVALVES PATELLA. 139 



The Patella Hungarica is sometimes found in a fossil 

 state, as is also the Patella echinata or spiny limpet, 

 which is fro:n the neighbourhood of Crignou. 



The Pal oil A :\re usually found adhering by their base 

 to rocks, stones, fuci, and other marine substances, from 

 which they are with much difficulty removed. They in- 

 habit the following places, viz. the Indian, Southern, Eu- 

 ropean, Northern, and Mediterranean seas; the American 

 and hidian islands; the Atlantic, and the shores of China, 

 Greenland, and Iceland. 



The Patellae probably derive their name from their 

 resemblance to a little dish or bason reversed. 



VATEhLA.-Limpet 



A. Having an internal lip ; shell entire. 

 Equestris {Cup ^saucer L.) Rugosa. 

 Neritoidea {Chambered L.) Goreensis {Sandal.) 

 Sinensis {Chinese bonnet JL,.)Contorta. 



B. Margin angular or irregularly toothed. 

 Crepidula {Transparent L.)*Vulgata {Common L.) 

 Laciniosa {Double-eyed L.) *Depressa. 

 Saccharina {Star L.) Ccerulea. 



Barbara {Toothed L,) Tul)erculata. 



Cranularis {Granulated L.) Lepas. 

 Granatina {Garnet L.) Tricostata. 



