428 American Seashells 



ous evenly spaced, fine, concentric grooves. Area near umbones smooth. 

 Color glossy and variable: whitish, yellowish or flushed with pink. Interior 

 glossy-yellow or pinkish. A common shallow-water species which should 

 always be compared with lineata. 



The similar Tellina angulosa Gmelin from the Keys and West Indies 

 is not so elongate, has finer grooves and a more highly glossed surface which 

 is commonly covered with a greenish-yellow, thin periostracum. Common 

 in sand. 



T. piinicea Born (which Dall called angulosa Gmelin) from the Keys 

 (rare) and West Indies (common) is similar, but is always bright water- 

 melon-red internally and purplish red exteriorly. The pallial sinus just 

 touches the anterior muscle scar, which it does not in alternata or angulosa. 



Genus Arcopagia Brown 1827 

 Subgenus Cyclotellina Cossmann 1886 



Arcopagia fatista Pulteney 1799 Faust Tellin 



Plate 40) 



North Carolina to southeast Florida and the West Indies. 



2 to 4 inches in length, oval, moderately inflated, fairly heavy, and 

 smoothish, except for small, rough, concentric lines of growth. Hinge strong, 

 the posterior lateral in the right valve being long and strong. Color outside 

 a semi-glossy-white; inside highly glossed and enamel-white with a yellowish 

 flush. Do not confuse with T. laevigata which is glossy outside and has 

 orange-tinted margins. Moderately common in the West Indies. Donovan 

 gave this species the same name in 1 80 1 . 



Genus Strigilla Turton 1822 



Tellin-like shells, usually oval in shape and with inconspicuous growth 

 lines crossed by fine, oblique, cut lines. There are only four species in the 

 western Atlantic. 



Strigilla carnaria Linne Large Strigilla 



Plate 40c 



North Carolina to Florida and western Caribbean. 



% to I inch in length, oval, slightly oblique, moderately compressed, 

 fairly thin but strong. Outer surface finely sculptured by cut lines which 

 are obliquely radial in the central and posterior regions of the valve. At the 

 anterior third of the valve, there are wavy, oblique threads running in the 

 opposite direction. Exterior pinkish white with former, concentric growth 

 stages a deeper pink. Interior bright watermelon-red. The upper line of 



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