lU 



LAND AND FRESH-WATER SHELLS OF N. A. [PART L 



Fig. 191. 



convex, the last deflexed, constricted, the base inflated, and sculptured 

 beneath the epidermis with numerous impressed spiral lines ; the aperture 

 very oblique, narrowly ear-shaped, contracted by a 

 strong linguiform tooth extending along the entire 

 parietal wall ; peristome callous, somewhat reflected, 

 the margin joined by a sinuous callus, the basal 

 margin thickened, inwardly much dilated, with a 

 deep and wide notch in the middle ; with an internal 

 transverse tubercle on the base of the shell. Greater 

 diam. 12^, lesser 10 ; height 6^ mill. 



Helix labrosa, Bland, Ann. N. Y. Lye. VII, 430, pi. 

 iv, f. 19 (1861). 

 Stenotrema labrosa, Tryon, Am. Journ. Conch. Ill, 59, pi. ix, f. 25 (1867). 



Arkansas, Alabama, Tennessee. • 



The thickened and reflected peristome, and deep wide notch, 

 sufficiently distinguish H. labrosa from H. edgariana. The noteh 

 in the latter, situated in the centre of the aperture as in H. steno- 

 trema, is in a measure obsolete, but in H. labrosa it is strongly 

 developed, and nearer to the outer edge of the peristome, as in 

 H. hirstda. The form of the parietal tooth of this species is like 

 that of H. hirsuta, while H. edgariana is in that particular more 

 like H. stenotrema. H. edgariana, in fact, connects H. steno- 

 trema with H. spinosa, but H. labrosa is rather allied to H. hir- 

 suta, and in the character of the peristome to H. maxillata. 



Fig. 192. 



Helix edgariana, Lea. — Shell imperforate, lenticular, carinated, 

 solid, arcuately striate, under the epidermis yellowish flesh-color, with 

 distant, short, prostrate hairs ; spire convex conoid, rather 

 obtuse ; whirls five, flattened, the last anteriorly deflected, 

 subconstricted ; aperture very oblique, most narrowly ear- 

 shaped, narrowed by a stout, tongue-shaped, arcuately 

 entering tooth on the full length of the parietal wall ; 

 peristome subcontinuous, its iipper margin subsimple, 

 its basal margin much dilated inwardly, with a slight 

 median cleft ; far within on the base of the shell is a 

 stoat, transverse tubercle. Greater diam. 9, lesser 8 ; 

 height 5 mill. 

 CaracoUa edgariana, Lea, Trans. Am. Phil. Soc. IX, 2 ; Obs. IV, 2 (1843) ; 

 Proc. II, 31 (1841) ; in Tjkoschel's Arch. f. Nat. 1843, 11, 124. 



Eelix edgariana, 

 enlarged. 



