Remarlis on Certain Species of North American Helicid^. 



By Thomas Bland. 

 Kead December 16th, 1861. 



Eeprlnted from tho Annals of the Lyceum of Natural History, New York, Vol. VII., 



December, 1S61. 



Helix Dowiiieana nov. sp. 



Plate IV. fig. 23-24. 



T. subobtecte umbilicata, subglobosa, tenui, subpellucida, obsolete 

 costulato-striata, lineis spiralibus impressis sublente confertim decussata, 

 virenti-coinea ; spira brevi, obtusa ; aiifr. 5, convexis, ultimo tumido, 

 antics gibbosulo, vix desceiidente, constricto ; apertura obliqua, lunato- 

 ovali ; perist. albo, labiato, reflexo, margine dextro expanso, columellari 

 angulatim dilatato umbiliciim fere tegente. 



Shell umbilicate, umbilicus nearly covered, subglobose, thin, 

 subpellucid,with obsolete rib-like stri^, decussated with crowded 

 microscopic spiral lines, greenish horn-colored ; spire short, 

 obtuse ; whorls five, convex, the last tumid, anteriorly some- 

 what gibbous, scarcely descending, constricted ; aperture ob- 

 lique, lunate-oval ; perist. white, labiate, reflected, right margin 

 expanded, columellar margin angularly dilated, nearly covering 

 the umbilicus. 



Diam. maj. 10^, min 9^, Alt. 6 mill. 



Station. — Among leaves, at the roots of grass and shrubs in 

 rocky places. 



Habitat. — University Place, Franklin Co., Tenn. Downie ! 



RemarTcs. — In the autumn of 1860 1 received three specimens, 

 through Bishop Elliott, from Major Downie of Brunswick, Ga., 

 to whom I dedicate the species. In form and aspect it is most 

 like H. Ctiristyi Nob., but has no parietal tooth ; it is allied 

 also to U. clausa Say, and H. Mitohelliana Lea. 



