160 AMERICAN MARINE CONCHOLOGY. 
elevated, remote, lamellar bands, white, with blotches of red or 
purple, or bluish-gray. 
Length 22.5, height 20 mill. 
North Carolina, southwards. 
2. C. TRAPEZOIDALIS, Kurtz. 
(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. ALVEATA ( Venus), Conrad. 
C. IN=/QUALIS (Venus), Say. 
These species are included in Stimpson’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. 80. 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. aiGANTEA, Chemnitz. Fig. 396. 
Conch. Cab., f. 1661. 
Shell large, ovate, smooth, slightly 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 rays, generally inter- 
rupted. 
Length 6, height 3.25 inches. 
North Carolina, southwards. 
2. C. MAcULATA, Linneus. Fig. 397. 
(Venus.) Syst. Nat., edit. xii. 432. 1767. 
Shell oval, rather compressed, posteriorly ; obliquely somewhat 
produced; fawn white, blotched or waved with violet brown, en- 
veloped with a shining horny epidermis. 
Georgia to West Indies. 
3. C. Savana, Conrad. Fig. 398. 
(Cytherea.) -Am. Journ. Science, xxiii. 345. 18338. 
C. convexa, Say, of authors. 
Shell moderately solid, ventricose, subcordate; beaks elevated, 
