294 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



spiral lines beneath the epidermis; suture deeply impressed; aperture oblique, 

 transverse, auriform, narrowed by a slender, slightly arcuate, lamelliform 

 parietal tooth extending across from the umbilical axis, and terminating with 

 a short angular deflection within the aperture ; upper margin of tbe peristome 

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

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

 an internal transverse tubercle on the base of the shell. Greater diameter 9, 

 lesser 8 mill. ; height, 5 mill. 



Helix Edvardsi, Bland, Ann. N. Y. Lye, VI. 277, PI. IX. Figs. 14-16 (1858). 



— W. G. Binney, Terr. Moll., IV. 63, PI. LXXIX. Figs. 7-9 ; L. & Fr.-W. 



Sh., I. 115 (1869). — Pfeiffer, Mai. Piatt., 1859, 13. 

 Stenotrcma Edwardsi, Tryon, Amer. Journ. Conch., III. 59 (1867). 



Mountains of Fayette or Green Brier County, Virginia ; Laurel and Wbitly 

 County, Kentucky. A species of the Cumberland Subregion. 



This species is allied to, or rather intermediate between, barbigerum and hir- 

 sutum, Say, — tbe former connecting spinosum with fraternum. It is smaller, 

 more elevated, less acutely carinated, and readily distinguished from S. barbige- 

 rum by tbe partially appressed, notched peristome, and tbe different character 

 of the epidermis. In barbigerum the attached hair-like epidermidal processes 

 are produced, at the sutures 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 Mesodon 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 mar- 

 gin 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. hirs^i- 

 tiun, while barbigerum is in that particular more appropriately compared with 

 fralernum, Say. 



Jaw, as usual, with 13 broad, crowded ribs. 



Lingual membrane (PI. VII. Fig D) with 20—1—20 teeth; 9 perfect lat- 

 erals ; the eleventh tooth has its inner cutting point bifid. 



Genitalia not observed. 



Stenotrema barbigerum, Redfield. 



Shell imperforate, sharply carinate, rather thin, dark horn-colored or brown ; 

 tbe upper surface has the epidermis raised into acute striae, which at the suture 

 and carina are produced 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, but indented in the umbilical region; spire 

 slightly convex ; whorls 5k, rather flat, last one suddenly but slightly deflected; 

 ai» "i, e very obliuue, transverse, ear-shaped, narrowed by a rather slender, 



