76 BIVALVES— PINNA. 
than an inch in length, but the adults often exceed 
three feet. 
The Pinne 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 Pinne are usually found in smooth water and 
bays; in some places they are esteemed excellent and 
luxurious food. The Mediterranean 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. 
Tlivva (Pinna), like the preceding genus, admits only 
of conjectural definition. 
Drvis10n I.—Shells longitudinally ribbed. 
Scientific Name. Locality. Common Name. 
Rudis -+++-++ «+6. Mediterranean, Southern 
and Asiatic Seas ---- Rough Pinna -- 
Pectinata -+-+---- Coromandel, Britain ---- Spiny ribb’ddo -- 
Inflata ----++---- Nicobar Isles-+-++-+-++++- Inflated---- do -- 
Carnea---+-++++-- Dorsetshire, West Indies Flesh colored do 
Rigida AGOHOOR OO Guraconikcerisimeivocicidecicic Rigid OLICIC do -- 
Nobilis----+-..-. Mediterranean, Adriatic. Great -- -. do - 
Muricata -------- E. Indies, Mediterranean Prickly---. do -- 
Adusta +--+++-+- South Seas, Manilla ---- Pear shap’d do -- 
Vexillum ------ East Indies ---...-. ee-s Banner --+ do -- 
Squamosa -+++--- Mediterranean --------- Sealy --- - do-- 
Watreav emote astalndies, slerclercistcece Brittle ---. do-- 
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