The Jingle Shells 



in outline, the upper valve tinged rusty, the lower greenish. A 

 thick callus surrounds the byssal aperture inside. Diameter, 

 3 inches. 



Habitat. — Australia. 



The Noble Anomia (A. nobilis, Rve.) wears obtuse scales 

 on the distant ribs of the greenish white upper valve. The lower 

 one is a rich turquoise blue. Length, 2 inches. 



Habitat. — Hawaiian Islands. 



Genus PLACUNANOMIA, Desh. 



The Western P. macrochisma, Desh., has a large, arched 

 upper valve, rough, and irregularly ridged outside, brilliant, iri- 

 descent green inside. The flat under valve is far too small to 

 meet the rim of the upper one. The byssal aperture is much 

 larger than in Anomia. A muscle scar curiously rayed is visible 

 through this hole. Though normally circular, the shell is very 

 irregular in growth. The flesh is bright orange and very good 

 eating. Diameter, 2 to 4 inches. 



Habitat. — Pacific coast of United States. 



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