HELIX. 



151 



Mr. Bland has a specimen with a well-developed parietal 

 tooth. 



Fig. 257. 



Helix downieana, Bland. — Shell umbilicate, umbilicus nearly 

 covered, subglobose, thin, subpellucid, with obsolete rib-like striae, de- 

 cussated with crowded microscopic spiral lines, greenish horn- 

 colored ; spire short, obtuse ; whirls five, convex, the last 

 tumid, anteriorly somewhat gibbous, scarcely descending, 

 constricted ; aperture oblique, lunate oval ; peristome white, 

 labiate, reflected, right margin expanded, columellar margin 

 angularly dilated, nearly covering the umbilicus. Greater 

 diam. lOA, lesser 9i; height G znill. 



Helix (lownieana, Bland, Ann. N. Y. Lye. VII, 420, pi, iv, f. 



23, 24 (18(31). 

 Mesodon downieana, Tbton, Am. Journ. Conch. Ill, 47, pi. 



viii, f. 15 (1867). 



University Place, Franklin County, Tennessee. 



Fig. 258. 



Helix lejuna, Sat. — Shell umbilicated, subglobose; epidermis 

 corneous, nearly smooth; spire rather prominent; suture impressed;, 

 whirls rather more than five, the last ample ; striae of increase 

 hardly visible; peristome white, very narrow, reflected, a deep 

 groove behind it ; aperture well rounded, semicircular, con- 

 siderably contracted by the impressed groove beliind the peri- 

 stome, and a corresponding testaceous deposit, or rib, within; 

 umbilicus small, round, not expanded ; umbilical region not 

 impressed; base convex. Greater diam. S, lesser 7 ; height Al mill. 



Helix jejuna, Say, Journ. Phila. Acad. II, 158 (1821); Bixxey's ed. 9. — 



DeKay. N. Y. Moll. 46.— Pfeiffer, Mon. Hel. Viv. I, 147.— Bland, 



Ann. N. Y. Lye. VI, 341 (1858).— W. G. Binney, Terr. Moll. IV, 67. 



Helirmobiliana, Lea, Proc. Am. Phil. Soc. 11,82(1841); Trans. Am. 



Phil. See. IX, 17 ; Obs. IV, 17 (1844) ; in Tkoschel, Arch. f. Nat. 



1843, n, 124.— Pfeiffer, Mon. Hel. Viv. I, 323; IV, 122.— Binnev, 



Terr. Moll, II, 172, pi. xUi, f. 2. 

 Hypromia jejuna, Teyon, Am. Journ. Conch. II, 308, pi. v, f. 3 (18G6). 



Georgia, Florida, Alabama. 



