78 PROCEEDINGS OF THE ACADEMY OF [1899. 



Aperture narrow, having on each side 21 teeth, toward the ends 

 these extend entirely across the base. Represented by four speci- 

 mens, three of which measure as follows: 



Largest, length 17 mm., greatest diam. 12 mm. 



Specimen figured, length 15 mm., greatest diam. 10 nun. 



Smallest, length 13 mm., greatest diam, 9 nnn. 



Collected by the writer from the Jacksouian Eocene at Mont- 

 gomery, Grant Parish, La. 

 Cypraea vaughani n. sp. Plate II, fig. 7. 



Shell small, ovate, globose, smooth, ends slightly prolonged, 

 base rounded, aperture narrowed from the middle toward the pos- 

 terior, outer lip with 19 and the inner lip with 16 teeth, the latter 

 end abruptly and do not extend within the aperture, as in Cypnea 

 dalli, to which it is nearest related, it is also at once separated 

 from the latter by its smaller size. 



Length 9 mm., greatest diam. 6 mm. 



From the Lower Claiborne at Hammett's Branch, near Mt. 

 Lebanon, La. One specimen. 



This species is dedicated to Mr. T. Waylaud Vaughan of the 

 U. S. Geological Surrey, through whose kindness in giving such 

 explicit information of the Eocene localities of Louisiana I was 

 able to collect this and many other interesting forms. 



Cypraea attenuata n. sp. Plate II, fig. 8. 



Shell elongate, anterior and posterior ends greatly attenuated and 

 curved upward, smooth, with the exception of a few raised, revolv- 

 ing lines at each end, which are almost hidden by the heavy 

 marginal callus, base smooth. Outer lip with 24 and the inner 

 lip with 25 teeth, the central ones of the latter extending for some 

 distance within the aperture. Length 20 mm., greatest diam. 8 

 mm. 



One specimen collected by Mr. Frank Burns from the Lower 

 Claiborne, at Lisbon Bluff, Clarke Co., Ala. 



Cypraea (Cyprsedia) subcancellata n. sp. Plate II, fig. 9. 



Shell ovate, dorsal surface with 24 prominent revolving ridges, 

 alternated by a smaller one; in the two middle interstices and all 

 the interstices on the base of the shell, the smaller ridges are 

 wanting ; the entire shell has also small longitudinal raised lines, 

 that are entirely interrupted by the prominent revolving ridges, 



