A02 Eocene Fossils of the United States. 
seven are living inhabitants of the coasts of the Union. Of 
these, two live as far north as Massachusetts, L. radula, (LL. con- 
tracta, Say,) and L. divaricata, both of which also inhabit the 
-European coasts of the Atlantic. 'The others inhabit the coasts 
of Carolina and Florida, and one of them, L. crenulata, occurs at 
Cape Henry, Virginia. I obtained six species about Tampa Bay. 
One of these, L. Floridana, is very nearly allied to the Miocene L. 
anodonta, Say. The genus is more largely represented in our 
Miocene beds, by recent species, than any other group of shells. 
Lwerna atveata. Ovate, ventricose, with prominent concen- 
tric lines, and remote profound concentric sulci ; summits very 
elevated, medial; posterior margin truncated, diveets posterior 
side with an indistinct submarginal fold; cardinal and lateral 
ar distinct ; inner margin crenulated. (Plate IV, fig. 12.) 
eee Con.; Foss. Shells of Tert. Form., p. 40, 
} rocier, some specimens have a distinct fold, others 
Pe sulci vary much in number, generally from: two to 
five. ‘Occasionally traces of radiating lines are visible under a 
ands, which are most distinct on the margins of the sutures. 
Lucrna carinirera. Suborbicular, profoundly ventricose, with 
concentric acute strie; anterior side with a slightly impressed 
fold, and the superior margin with a short rostrum or prominent 
angle; posterior side with a narrow, profoundly impressed fold, 
emarginate at base; summits very prominent, submedial ; beaks 
ieurved ; cardinal sind lateral teeth distinct ; inner margin crenu- 
lated. (Plate IV, fig.15.) 
Lucina carinifera, Con.; Foss. Shells of 'Tert. Form., as 40, 
Nov. 1, 1833. 
L. cornutd, Lea; Cont. to Geol., plate i, fig. 29, Dec. 1833. 
Claiborne, Alabama. Rare. 
Luctva pomiia. Suborbicular, equilateral, convex or slightly 
ventricose, with remote profound concentric sulci, and obsolete 
striz ; an obscure trace of radiating lines; an impressed fold near 
either end margin, truncated, or sence tit emarginate at base; 
beaks prominent and pointed ; cardinal and lateral teeth distinct ; 
inner margin minutely crenulated. (Plate IV, fig. 17.) 
t pomilia, Con.; Foss. Shells of Tert. Form., p. AO, 
Nov ‘1, 1833. 
