86 HELICEA. 



Lea, a thin, brown, but more sparingly hirsute epidermis. I have 

 noticed the tubercle within the last whorl, near the aperture, in 

 fatigiata and Troostiana, but no such process exists in the species 

 now under consideration. In H. Hazardi, the inferior tooth of the 

 labrum, at its inner end, is continued back within the aperture, 

 forming a white erect lamella on the floor of the whorl, parallel 

 with, and leaving a narrow sinus between it and the inner wall, to 

 which it is joined at its extremity, about 24- mill, from the edge of 

 the peristome. The position of this lamella can be seen through 

 the shell. 



The species is also found among the Cumberland Moun- 

 tains of Tennessee (Elliott). 



Conrad, in the second volume (n. s.) of Silliman's Jour- 

 nal, speaks of finding H. plicata Say in Florida. He prob- 

 ably refers to some other species. 



HELIX DORFEUILLIANA Lea, 

 Plate LXXVIII. Figures 2, 14. 



Helix Dorfeuilliana Bland, Ann. N. Y. Lj'c. vi. p. 294; Notes, p. 18, pi. ix. figs. 



24-26; uec Pfeiffer, Deshayes, Chemnitz, Reeve. 

 Helix fatUiiata Binney, Bost. Journ. et Terr. Moll. 1. c. (excl. descr., syn. et fig. ) 

 Foli/gyra Dorfeuilliana Lea, 1. c. 



Troschel, Ar. f. Nat. 1839, ii. 222. 



The figure 2 which I have given is a fac-simile of Lea's ; 

 his description is as follows : — 



T. superne obtuso-conica, inferne subinflata, nitida, cornea, longi- 

 tudinaliter striata, late umbilicata ; anfr. 6; apertura lunata, triden- 

 tata. 



Shell above obtusely conical, below somewhat inflated, shining, 

 horn color; longitudinally striate, widely umbilicate ; whorls six; 

 aperture lunate, three toothed. 



Hab. Ohio. Mr. Dorfeuille, Cincinnati. 



Diam. .3 ; length .2 of an inch. 



Remarks. I adopt Mr. Say's genus Polygyra, believing the 

 division, though very artificial, quite as good as many made by 

 Lamarck. This species has, like P. fatigiata Say and P. plicata 



