1*28 UNIVALVES PATELLA. 



tlica, P. sanguinolenta and P. tesludinaria; the latter is 

 rather a rare species, and generally has its interior of a 

 silvery hue. The P. compressa is remarkable for its nar- 

 row and lengthened form, which gives it the appearance 

 of having been squeezed or pinched. 



The last division of the Patella includes the perfor- 

 ated species: the principal are the P. fissura, P. Graeca, 

 P. nimbosa, P. Jamaicensis, P. CajQfra, P. perforata, and 

 P. personata; the latter, when in fine preservation, is consi- 

 dered a rarity; it grows to a considerable size, and is 

 found at the Falkland Isles and the Straits of Magellan. 



The P. mytiliformis very much resembles a Mytilus; it 

 is from the Ferroe Islands. 



The P. Hungarica is sometimes found in a fossil state, as 

 is also the P. echinata in the neighbourhood of Crignou. 



The Patellae are usually found adhering by their base 

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

 which they are with much difficulty removed. They in-? 

 habit the Indian, Southern, European, Northern, and 

 Mediterranean seas; the American and Indian islands; 

 the Atlantic, and the shores of China, Greenland, and 

 Iceland. 



The Patellae derive their name from their resemblance 

 to a little dish or bason reversed. 



TATELh A.— Limpet 



A. — Having an internal lip; shell entire. 



Equestris — Cup Sf saucer. Fornicata — Slipper. 



Neritoidea — Chambered. Aculeata — Spiny-ribbed. 



Sinensis — Chinese bonnet. Trochiformis — Trochus-shap^d. 



Porcellana — White spotted. Auricula — Ear-shaped. 



