TRANSACTIONS 
OF 
THE AMERICAN PHILOSOPHICAL SOCIETY. 
ARTICLE I. 
Continuation of Mr. Lea’s Paper on Fresh Water and Land Shells. Read 
February 19, 1841. 
HELIX & CAROCOLLA. (Lamarcr.) 
Tne genus Helix is widely scattered over the soil of the United States, and the same 
species have in many instances a very wide geographical range. Climatal influence is 
very evident in many species.—In some localities they are more inflated and larger; in 
others more depressed, even becoming carinate like the genus Carocolla. The uncertainty 
of this carinate character has induced me to hesitate in the admittance of the genus Caro- 
colla, but the number of Helices is so great that a strong inducement is presented to pre- 
serve it for the present. 
The Helices of the United States are nearly all of a dull horn colour, and in this respect 
not very attractive. Most of the species are, however, furnished with apertures differing 
much from each other, and presenting the most interesting characters as regards teeth, &c. 
Mr. Say has described thirty-nine species, and seventeen have been proposed by myself 
and other naturalists. 'T'’o that number I propose now to add a single species, as well as 
one to the genus Carocolla. 
Hexix 'TENNESSEENSIS.* 
Testa supra plano-convexd, subtus convexd, luted, oblique striatd, umbilicatd; spird brevi; suturis subimpressis; 
anfractibus quinis, subconvexis; apertura lunatd; labro intus incrassato. 
Shell above plano-convex, beneath convex, yellow, obliquely striated, umbilicated; spire short; sutures somewhat im- 
pressed; whorls five, somewhat convex; aperture lunate; lip thickened within. 
Hab. Cumberland Mountains, Tennessee, S.M. Edgar, My Cabinet, and Cabinet of Mr. Edgar. 
Diam. .45, Length .32 of an inch. 
Remarks.—A. species very nearly allied to H. limbata, Drap. It differs in having a 
wider umbilicus, a less expanded aperture, and having an indistinct brownish line on the 
periphery, the imbata having a white and very distinct one. ‘The strie cover the whole 
* It is regretted that the figures to illustrate the species of Mr, Lea’s paper cannot now appear. It is hoped that they 
may be hereafter furnished. 
VOL, IxX,.—<a4. pu if ad 34. 4 
