76 BIVALVES PINNA. 



than an inch in length, but the adults often exceed 

 three feet. 



The Pinnae admit of some variation in color, though 

 they usually have a horn-like appearance, which is 

 often shaded with a steel-blue or copper-colored gloss. 



This genus produces, in large quantities, a very fine 

 sort of byssus or beard, which the Italians frequently 

 fabricate into various articles of wearing apparel, vieing 

 in appearance with the finest silk. 



The Pinnae are usually found in smooth water and 

 bays ; in some places they are esteemed excellent and 

 luxurious food. The MediteiTanean produces a great 

 number ; they are also to be found in the Indian, Ame- 

 rican, Atlantic, and European oceans, as well as in the 

 Adriatic and Red Seas. 



Ilivva (Pinna), like the preceding genus, admits only 

 of conjectural definition. 



Division I. — Shells longitudinally rihled. 



Scientific Name. Locality. Common Name. 



Rudis Mediterranean, Southern 



and Asiatic Seas • • • • Rough Pinna 



Pectinata Coromandel, Britain Spiny ribb'd do 



Inflata Nicobar Isles Inflated do 



Carnea Dorsetshire, West Indies Flesh colored do 



Rigida Curacoa Rigid do 



Nobilis Mediterranean, Adriatic Great • ... do 



Muricata E. Indies, Mediterranean Prickly do 



Adusta South Seas, Manilla .... Pear shap d do 



Vexillum East Indies , . Banner • • • do 



Squamosa Mediterranean Scaly • . • -do 



Vitrea East Indies Brittle do 



Papyracea Ditto Paper -...do 



