160 AMERICAN MARINE CONCHOLOGY. 



elevated, remote, lamellar bauds, white, with blotches of red or 



purple, or bluish-gray. 



Length 22.5, height 20 mill. 



North Carolina, soutJiwards. 



2. C. TRAPEZOiDALis, Kiirtz. 



{Venus.) Cat. Shells, N. and S. Car. 1860. 

 Shell covered with convex radiating ribs, set with brown spots 

 and scales of growth. A thin brown pile on good specimens. 



Length 12.5 mill. 



North and South Carolina. 



Fossil Species. 

 C. ALVBATA ( Veyius), Conrad. 

 C. iN^QUALis ( Venus), Say. 



These species are included in Stirapson's Catalogue of Shells of 

 the Atlantic Coast, but I am confident they have not been found 

 except in a fossilized condition. 



Genus CALLISTA, Poli. 

 Test. Sicil., i. 30. 1791. 



The mantle margins are plicate, with filaments above the base of 

 the respiratory siphon ; siphons united to their ends, crowned 

 with simple cirrhi. 



1. C. GiGANTEA, Clicmuitz. Fig. 396. 



Couch. Cab., f. 1661. 

 Shell large, ovate, smooth, slightl}' angulated on the anterior 

 side; posterior depression oblong-ovate, a little impressed on its 

 sides and keeled in the middle. Teeth compressed. Color pale 

 livid with numerous lilac longitudinal broad ra^^s, generally inter- 

 rupted. 



Length 6, height 3.25 inches. 



North Carolina, southwards. 



2. C. MACULATA, Liunaeus. Fig. 397. 



iVemis.) Syst. Nat., edit. xii. 432. 1767. 

 Shell oval, rather compressed, posteriori}^; obliquely somewhat 

 produced; fawn white, blotched or waved with violet brown, en- 

 veloped with a shining hornj' epidermis. 



Georgia to West Indies. 



3. C. Sayana, Conrad. Fig. 398. 



{Cytherea.) Am. Jouni. Science, xxiii. 345. 1838. 

 C. convexa, Say, of authors. 



Shell moderately solid, ventricose, subcordate ; beaks elevated. 



