21 C) A MANUAL OF AMKRIOAN LAND SHELLS. 



deflection within the aperture; upper margin of tlie peristome acuf6, 

 scarcely reflected, and partially appressed to the body-whorl, with a 

 tooth-like callus within, having an almost obsolete notch in the center; 

 with an internal transverse tubercle on the base of the shell. Greater 

 diameter 9, lesser 8"™; height, 5"™. 



HeliJC Edvardsi, Bland, Ann. N. Y. Lye, vi, 277, pL ix, figs. 14-16 (1858).— W. G. 



BiNNEY, Terr. Moll., iv, 63, pi. Ixxix, figs. 7-9; L. & Fr.-W. Sh., i, 115 



(1869).— Pfeiffer, Mai. Bliitt., 1859, 13. 

 Stenotrema Edwardsi, Tryon, Amer. Jonrn. Conch., iii, 59 (1867). 

 Stenotrema Edvardsi, W. G. Binney, Terr. Moll., v, 293. 



Mountains of Fayette or Greenbrier County, W, Virginia ; Laurel and 

 Whitley Counties, Kentucky. A species of the Cumberland Snbregion. 



This species is allied to, or rather intermediate between, harbigerum 

 and Mrsutuni, Say, the former connecting spinosum with fraternum. It 

 is smaller, more elevated, less acutely carinated, and readily distin- 

 guished from 8. harbigerum by the partially ai)i)ressed, notched peri- 

 stome and the different character of the epidermis. In barbigerum the 

 attached, hair-like epidermidal processes are i^roduced at the sntures 

 and carina into cilia, which are entirely wanting in this species. The 

 same processes, though less numerous and sometimes almost obsolete, 

 are observable at the base of the former, while in the latter the basal 

 epidermis approaches in character to that of Triodopsis palliata. The 

 deep characteristic notch in S. hirsutum is considerably less developed 

 in S. Edvardsi, and the callus which connects the parietal tooth with 

 the upper margin of the peristome in the former does not exist in the 

 latter. In the general character of the peristome the species under 

 consideration resembles S. hirsutum, while barbigerum is in that partic- 

 ular more appropriately compared -with fraternum, Say. 



Jaw as usual, with 13 broad, crowded ribs. 



Lingual membrane (Terr. Moll., V, Plate VII, Fig. D) with 20-1-20 

 teeth ; 9 perfect laterals ; the eleventh tooth has its inner cutting point 

 bifid. 



Genitalia not observed. 



Stenotrema bai'big:ei'uin, Redfield. 



Shell imperforate, sharply cariuate, rather thin, dark horn-colored 

 Fig. 203. or brown ; the upper surface has the epidermis raised 

 into acute striae, which at the suture and carina are pro- 

 duced into short cilia or bristles ; these epidermidal striae 

 are sometimes seen beneath, but less distinctly, being 

 often obsolete in the mature shell ; basal surface convex, 



