TRANSACTIONS OF WAGNER 

 1438 



TERTIARY FAUNA OF FLORIDA 



Erycinella ovalis Conard. 

 Plate 53, Figure 2. 



Erycinella ovalis Conrad, Fos. Medial Tert., p. 74, pi. xlii., fig. 5, 1845 ; Proc. Acad. Nat. 



Sci. Phila., xiv., p. 578, 1863; ibid., xvi., p. 212, 1864; Meek, Checkl. Inv. Fossils, 



Miocene, N. Am., p. 7, 1864. 

 Erycina ovalis Orbigny, Prodrome Pal., iii., p. 115, 1857. 

 Not Erycinella ovalis S. V. Wood, Mon. Crag. Moll., p. 171, pi. xv., figs. loa-iof, 1853 



(=:£. pygmcEa S. Wood, Cat. Crag. Moll., 1840). 



Miocene of the York River, Virginia, at Yorktown and various other locali- 

 ties above Yorktown on the banks of the river. 



The small valves of this species are not uncommon in the locality men- 

 tioned, but are very frequently waterworn, so that to obtain a clear idea of the 

 hinge it is best to find a pair with the valves united, in which the remains of 

 the resilium will often be found preserved. 



Subgenus CARDITOPSIS Smith. 



Erycinella (Carditopsis) Bernardi n. sp. 



Plate 53, Figure id. 



Pliocene clays of Limon, Costa Rica ; R. T. Hill. 



Shell minute, inequilateral, moderately convex, subquadrate, white, with 

 about fourteen strong, rounded, radial, beaded ribs separated by deep, nar- 

 rower, channelled interspaces ; the beak is about five-twelfths of the length 

 from the anterior end, smooth, conspicuous, convex, the prodissoconch limited 

 by a thin, sharp, elevated, concentric lamina; the anterior slope is direct or 

 slightly convex, the posterior longer, concave, with a depressed area bounded 

 by a somewhat imbricated rib, but there appears to be no definite lunule ; the 

 interior is polished, with the exterior sculpture reflected by riblike radial eleva- 

 tions ; in the right valve there are two minute cardinals between which is the 

 socket of the resilium ; the anterior dorsal margin is grooved to receive a small 

 lateral from the opposite valve, and the posterior margin, bevelled and promi- 

 nent, probably received into a groove in the left valve ; the posterior end is 

 subtruncate with an angle at the end of the dorsal slope ; the base arcuate and 

 serrate by the external sculpture ; muscular impressions obscure. Length 2.0, 

 height 1.6, diameter 1.3 mm. 



A single right valve of this little shell was obtained from the clay. It has 

 essentially the hinge of Carditopsis, but differs from the other species by the 

 raised rim of the prodissoconch, a feature recalling Condylocardia, which has, 



