372 American Seashells 



shell is attached to a rock or wood surface by means of a calcified byssus 

 which passes through a large notch in the right valve. The genus Pododes- 

 mus differs in having only 2 muscle scars in the top or holeless valve. 



Anomia simplex Orbigny Common Jingle Shell 



Plate 35k 



Cape Cod to Florida, the Gulf of Mexico, and the West Indies. 



I to 2 inches in size, irregularly oval, smoothish, thin but strong. The 

 upper or free valve is usually quite convex; the lower valve is flattish and 

 with a hole near the apex. Color either translucent-yellow or dull-orange. 

 Some with a silvery sheen. Specimens buried in mud become blackened. 

 Very commonly attached to logs, wharfs and boats. 



Anomia aculeata Gmelin Prickly Jingle Shell 



Nova Scotia to North Carolina. 



Rarely exceeding % inch in size, irregularly rounded, moderately fragile. 

 Upper valve convex, rough, often with small prickles. Lower valve flat and 

 with a small hole near the hinge end. Color drab, opaque whitish tan. A. 

 common cold-water species attaching itself to rocks and broken shells. 



Anomia peruviana Orbigny Peruvian Jingle Shell 



Plate 296 



San Pedro, California, to Peru. 



I to 2 inches in size, variable in shape, thin, partially translucent, smooth 

 or with irregular sculpture; colored orange or yellowish green. Occurs be- 

 tween tides attached to rocks, other shells and waterlogged wood. Common. 



Genus Pododesmus Philippi 1837 

 The valve without the hole has i large and i small muscle scar. 

 Pododesmus macroschismus Deshayes False Jingle Shell 



Plate igdi 



Alaska to Lower California. 



I to 4 inches in size. Radiating ribs very irregular and coarse. Color 

 yellowish or greenish white, inner surface green and somewhat pearly. Lower 

 valve with a large opening for the byssus. This is a very common species 

 which is found attached to stones and wharf pilings from low-tide mark to 

 about 35 fathoms. Often found on Haliotis. P. cepio Gray is a synonym. 



Pododesmus rudis Broderip from Florida and the West Indies is very 



