PATELLA. 



465 



The species of this genus are very numerous, and are 

 world-wide in their geographical distribution, being found 

 on the shores, usually affixed to rocks, to which they ad- 

 here with the greatest tenacity. The Patelloi possess the 

 power of boring in a slight degree ; the excavations are 

 produced simply by mechanical attrition, the foot being 

 strengthened with hard, crystalline, siliceous spicula, 

 similar to those in the foot of the perforating Pholades. 

 One species, P. vulgata^ is very abundant on our own 

 shores, and is extensively used by fishermen as bait ; in 

 the north of Ireland many tons' weight are annually col- 

 lected as food among the poor. 



Species of Patella. 



Adansonii, Dkr. 

 senea, Martyn. 

 albida, Mart. 

 angulosa, GmeL 

 argentea, Quoy and Gaim. 

 athletica, Lam. 

 barbata, Linn. 

 Capensis, Gmel. 

 chlorosticta, Gmel. 

 citrulus, Gould. 

 costoplicata, Mart. 

 cljpeaster, Lesson. 

 fimbriata, Gould. 

 flammea, Gmel. 

 flexuosa, Quoy and Gaim. 

 granatina, Linn. 

 granulans, Linn. 

 Guineensis, Dkr. 

 guttata, UOrh. 

 illuminata, Goidd. 

 instabilis, Gould. 

 Kraussii, Dkr. 



VOL. I. 



laciniosa, Linn. 

 langula, Meusch. 

 lineata, Lam. 

 Lowei, D'Orb. 

 luctuosa, Gould. 

 lugubris. Mart. 

 luteola, Lam. 

 Lusitauica, Gmel. 

 Magellauica, Gmel. 

 mamillaris, Linn. 

 miniata. Born. 

 nigro-squamosa, Dkr. 

 novem-radiata, Quoy and 



Gaim. 

 oculata, Meusch. 

 oculus, Born. 

 oruata, Dillw. 

 Paumotensis, Goidd. 

 petasus, Meusch. 

 piperita, Gould. 

 puncturata, Lam. 

 Reynaudi, Desh. 



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