UNIVALVES PATELLA. 13/ 



There are other species which are as it were cham- 

 bered or vaulted, having something of the appearance of 

 a slipper; such are the Patella porcellana, Patella forni- 

 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 tiie Patella laciniosa, Patella saccharina. Patella 

 grauulatus or granulated limpet, and Patella granatina 

 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 con- 

 cha 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 ai-gen- 

 tea, which have a sort ofmetallic 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 ex- 

 ceedingly conical and erect. 



The Patella Sinica, usually named the umbrella or pa- 

 rasol 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 

 scalloped. 



The next division comprehcudN s^uch as arc cap-shaped. 



