TRANSACTIONS OF WAGNER 



1274 



TERTIARY FAUNA OF FLORIDA 



limited, striated, unequally divided between the valves, smaller in the right 

 valve; the fight portion of the escutcheon somewhat overlapping but not 

 hiding the deeply sunken ligament ; inner margins finely crenate ; pallial sinus 

 small, triangular; anterior right and posterior left cardinals slender, laminar, 

 entire, the others grooved or bifid, a minute pustular anterior lateral present in 

 the left valve. Type Venus plicata Gmelin. 



The minute lateral has generally been overlooked and the shell associated 

 with Chione, from which it also differs by the character of its sculpture. 



Subgenus LEPIDOCARDIA Dall. 



Lepidocardia Dall, Proc. U. S. Nat. Mus., xxvi., No. 1312, p. 356, 1902. 



Shell small, compressed, rounded and short in front, elongated and pointed 

 behind, smooth or concentrically striated, polished, with delicate coloration ; 

 lunule narrow, circumscribed, but no defined escutcheon; internal margins 

 smooth ; pallial sinus linguiform, horizontally extended, pointed in front, partly 

 confluent with the pallial line below ; anterior left and posterior right dorsal 

 margins beyond the hinge-plate grooved to receive the edge of the opposite 

 valve ; teeth delicate, anterior laterals well developed ; posterior right and two 

 anterior left cardinals more or less distinctly grooved. 



Type Chione fioridella Gray (1838) -f- Venus africana Philippi, 1843. 

 Africa. 



This group recalls Gomphina in its general appearance, though much less 

 inflated. The species have been referred to several unrelated groups. The 

 coloration is extremely variable and is not excelled in beauty by any of the 

 Veneridce. 



The Cytherea semipunctata figured (plate xiii., fig. 19) but not described 

 by Conrad, in his memoir on the fossils of the Vicksburgian, of 1848, I have 

 not found any other reference to. It may be a Gouldia or a small species of 

 Pitaria. 



Cytherea tarquinia Dall. 



PLATE 38, FIGURES 2, 2a. 



Venus magnified Heilprin, Trans. Wagner Inst., i., p. 116, 1886; not of Sowerby, 1853. 

 Venus tarquinia Dall, Trans. Wagner Inst., iii., p. 1194, pi. xxxviii., figs. 2, 2a, 1900. 



Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay, Florida, 

 Willcox and Dall; St. Domingo, Gabb. 



Shell short-ovate, moderately convex, with low, inconspicuous beaks : sculp- 

 tured with numerous even, regular, thread-like radial riblets, separated by 



