OP CONCHOLOGY, 



HI 



MYSIA, Leach. 



M. AsTAETiFORMis, nob. — t. 11, fig. 15. 



Mysia Astartiformis, Conrad. — Jour. Acad. Nat. Sciences, 2d 

 series, iv., p. 296. 



M. LEVIS, nob. 



Description. — Suborbicular, thin, convex, inequilateral ; pos- 

 terior margin subtruncated. 



Sphserella levis, C. — Cat. of Eocene Shells in this Journal, 

 Part 1, p. 9. 



Locality. — Claiborne, Alabama. 



It is smaller than Diplodonta hidens, Deshayes, but more 

 nearly resembles it than any other species of the Paris Eocene- 



M. DELTOIDEA, nob. — t. 11, fig. 10. 



Description. — Subtriangular, ventricose, subequilateral ; pos- 

 terior margin obtusel}^ rounded; anterior angular; extremity 

 medial compared with the height; disk anteriorly concen- 

 trically striated, posteriorly smooth. 



Locality. — Claiborne, Alabama. 



NUCULANA, Link. 



N. PROTEXTA, nob. — pi. 11, fig. 6. 



Description. — Elongated, slightly ventricose, with closely- 

 arranged, minute thread-like concentric lines, distinct and 

 rugose on the anterior submargin, which is flattened, or broadly 

 and slightly furrowed ; upper margin oblique, medially recti- 

 linear, refiexed at the end; posterior extremity above the 

 middle and on a line with the anterior end ; posterior ventral 

 margin obliquely truncated. 



Locality. — Alabama. Dr. Sho waiter. 



ACT^ONEMA, Conrad. 



Gselatura, Conrad.^Amer. Jour. Conch., No. 1, p. 35. 



Description. — Conical; volutions numerous, sculptured as 

 in the genus Actxon, Montfort; aperture suboval, acutely 

 rounded and reflected at base; peristome not continuous. 



This genus has some resemblance to Aclis, Loven, but the 

 sculpture is the same as in Actseon, and the aperture like that 

 of many species of Melania., Lam. 



A. STRIATA. — t. 11, fig. 2. 



Pasithea striata, Lea. — Contribntions to Geology. 



