106 UNIVALVES. PATELLA. 



bered or vaulted, having something of the appearance ofa 

 slipper; such are the Patella Porcellana, Patella Foriii- 

 cata, and Patella Trochiformis, from the Falkland Isles. 

 It must be observed that the two former species very 

 closely resemble Nerites, and it is doubtful whether they 

 ought to be classed with this genus or not. 



There are some species which are more compressed, 

 having their margins angularly or irregularly toothed; 

 such are the Patella Laciniosa, Patella Saccharina, Pa- 

 tella Granulans or Granulated Limpet, and Patella Grana- 

 tina commonly called the Garnet Limpet. The Patella 

 Vulgata or Common Limpet, is the species so abundantly 

 found on the British shores. 



The Patella Lepas, usually known by the name of 

 Concha Lepas, is one of the rarities and curiosities of this 

 genus; there are two varieties of it, one from Chili, the 

 other from the Falkland Isles. There are some species of 

 Limpets, as the Patella Magellanica, and Patella Argen- 

 tea, which have a sort of metallic gloss diffused over their 

 surfaces, they are therefore called Bronze Limpets. The 

 two varieties are distinguished by the one being called 

 the Silver Bronze, and the other the Golden Bronze; 

 some of them are flat and compressed, whereas others 

 are exceedingly conical aud erect. 



The Patella Sinica, usually named the Umbrella or 

 Parasol Limpet, is another of the rarities of the genus; it 

 sometimes grows to a large size, it is a flat, broad, expand- 

 ing shell, of a blueish white color, having its interior of 

 a glossy yellowish or brownish cast, and the tip generally 

 of a beautiful orange color; the margin is often circularly 

 scolloped. 



The next division comprehends such as are cap-shaped, 

 having a recurved tip or crown. The Patella Hungarica 

 is the most remarkable of them, and is a beautiful shell ; 



