TERTIARY AND QUATERNARY PALEONTOLOGY, NORTHEASTERN FLORIDA 47

 Cotypes (Cat. No. U. S. N. M. 352276, spec. A; 352277, spec. B). These measure: length,-specimen A, 2.5; specimen B, 2.3 mm.; diameter of aperture,-specimen A, .6; specimen B, .7 mm.; diameter posterior end,-specimen A, .5; specimen B, .5 mm.
 Geologic horizon: Upper Pliocene or lower Pleistocene.
 Type locality: One-half mile above A. C. L. R. R. bridge over St. Johns River,. Putnam Co., Fla., five feet above high-water level and seven feet below surface. F. G. Clapp, collector, U. S. Geol. Surv., Sta. No. 6096.
 Discussion: This species somewhat resembles Caccum carolinianum Dall, but differs from the latter- in having an anterior ring, a. more rounded plug, and lacking longitudinal sculptured strie. It is closely related to Caccuin chipolanumn Gardner (an unpublished \ls.) species from the Chipola marl member of the Alum Bluff formation, but the latter possesses an anterior furrow and is a much heavier and more tapering shell.


 CARDITA (CARDITAMERA) oscEOLAENSIS N. SP.
 Plate I, Figures 11 and 12.
 Shell very thin, small, ovate; beaks not prominent, slightly twisted forward, situated at the anterior third of the valves; lunule long, moderately impressed; anterior side and middle of valves rounded; posterior side steeply sloping; posterior dorsal margin nearly straight, sloping at a low angle; anterior dorsal margin sloping and slightly undulated; posterior margin nearly straight, truncating the end, making nearly a right-angle with the dorsal margin and a rounded edge with the ventral; anterior margin rounded; ventral margin arcuate. Shell sculptured radially by 20, rather low, rounded ribs, nodulous about the beaks and roughened distally by transverse ridges or imbricated growth lines. Whole surface sculptured radially by fine, indistinct lines and transversely by rather fine imbricated growth structure. Inter-radial spaces about one and one-half as wide as ribs on the anterior and center of the disk, but narrower at posterior angle where ribs widen out. Lateral teeth small; anterior cardinal slender and prominent. Interior surface markedly fluted, reversing external sculpture and showing a pecten-like appearance.