THE NAUTILUS. 75 



surface having a polished look ; smooth internally, cardinal tooth 

 large, projecting. 



Lon. 3 mm. ; alt. 3 mm. 



LOCALITY. Wood's Bluff, Ala. 



REMARKS : This little shell differs from any Corbula known to 

 the writer by its polished appearance, and its few impressed lines, 

 rare. One small valve does not have any depression running from 

 beak to base, but is quite regularly rounded. 



ARCA (BARBATIA) LIGNITIFERA n. sp. PI. v, figs. 6, 7. 



Shell small, thin, extremities rounded, moderately convex, beaks 

 small and flattened ; surface marked by many radial riblets crossed by 

 irregularly spaced lines of growth ; a depressed area running from 

 beaks to base nearly central ; valves smooth internally, but showing 

 faint lines corresponding to some of the riblets. Hinge line long, 

 slightly curved ; the hinge carries four close-set teeth anteriorly, 

 next a short vacant space, and then ten to thirteen small teeth, 

 larger and more nearly parallel to the hinge line as they approach 

 the posterior. 



Lon. 5 mm. ; alt. 3 mm. 



LOCALITY. Six miles east of Thomasville, Ala., Wood's Bluff 

 horizon. 



SlGARETUS (EUNATICINA) ERECTOIDES n. Sp. PI. V, figS. 8, 9. 



Shell small, thin, whorls five rapidly enlarging, apex somewhat 

 twisted ; the first two whorls smooth, the others covered with very 

 numerous fine raised lines which become coarser on the body whorl. 

 Aperture oblong, nearly twice as long as broad ; outer lip slightly 

 thickened ; umbilicus channeled, and slightly open. 



Lon. 6^ mm.; diam. 4 mm. 



LOCALITY. De Soto, Miss., Claibornian. 



REMARKS : This little shell has very much the form of a small 

 Succinea, and resembles in miniature the living forms of the subgenus. 



VERTICORDIA (HALIRIS) GRANULOIDES n. sp. PI. v, fig. 10. 



Shell small, rather rotund, surface with numerous rounded ribs, 

 about nineteen in the type; they are granulated under a glass, and 

 rather scabrous between the ribs, especially on the anterior. Pos- 

 terior slope slightly angulated ; basal margin crenulated. The riba 



