502 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



MACTRA MISSISSIPPIENSIS Conrad. 



Mactra mississippiensis Conrad, Journ. Acad. Nat. Sci. Phila., new ser., vol. 1, 

 1848, p. 121, pi. 12, fig. 14. 



Locality. — Station 3401, on the west bank of Flint River, 3 miles 

 below Bainbridge, Decatur County, Georgia, at Cherry Chute; T. W. 

 Vaughan, 1900. U. S. Nat. Mus. Cat. No. 166776. Also from the 

 Oligocene of Vicksburg, Mississippi; Conrad. 



CONUS VAUGHANI, new species. 



Plate 86, fig. 1. 



Shell of moderate size, solid, oonic, with about 11 whorls excluding 

 the (defective) nucleus; the spire is moderately elevated, wavy- 

 nodulous at the shoulder, with a very narrow but sharply cut suture; 

 between the shoulder and the edge of the suture are three distinct 

 spiral threads with somewhat wider interspaces ; the sculpture of the 

 sides of the shell, for at least half the length of it, is composed of spiral 

 rows of low pustules apparently seated on obscure flattish spiral 

 threads. The remainder of the sides, the aperture, and the canal are 

 obscured by matrix. Height of shell, about 47 ; diameter at shoulder, 

 23 ; height of spire about 7 mm. 



Locality. — Station 7074, at Hale landing on the west bank of Flint 

 River, 7 miles southeast of Bainbridge, Decatur County, Georgia, in 

 coraUiferous chert; Vaughan, Cooke, and Mansfield, 1914. U. S. Nat. 

 Mus. Cat. No. 166720. 



This species recalls Conus consohrinus Sowerby, of the Santo 

 Domingo Ohgocene, but the granulation is not on elevated zones and 

 the spire is lower and less conspicuous, judging from the insufficient 

 description of this unfigured species, which is united by some authors 

 with the C. granozonatus of Guppy. 



CONUS COOKEI, new species. 



Plate 86, fig. 2. 



Shell of moderate size, regularly biconic, of eight or nine whorls, 

 each on the spire rising slightly above the suture in front of it, the 

 space between the sutures flattish, carrjdng three spiral threads with 

 wider interspaces; the shoulder of the whorl simple; in front of the 

 suture a very slight mflation of the upper half of the whorl, the rest 

 being direct and flattened; near the shoidder the whorl is sculptured 

 rather closely with obscure spiral threads; in front of these the sculp- 

 ture becomes strap-hke, separated by narrow sharp grooves; nearer 

 the canal these flat spaces begin to be divided by a shallow medial 

 groove, giving them a paired effect, these again become closer and 

 feebler close to the canal. Length, 38; length of shell in front of the 

 shoulder, 34; diameter at shoulder, 19 mm. 



