274 A MANUAL OF AMERICAN LAND SHELLS. 



Stenotreina labrosuiu. Bland. 



Shell imperforate, lenticular, carinated, the carina somewhat obsolete 

 behind the aperture, solid, with curved strioe, dark-brown colored be- 

 ^ip- "9"- neath the epidermis ; ei)idermis thin, with prostrate 



hairs ; spire convex-conoid, obtuse ; whorls 5J, rather 

 convex, the last deflexed, constricted, the base inflated 

 and sculptured beneath the epidermis with numerous 

 impressed spiral lines ; the aperture very oblique, nar- 

 s.iabrosum, eniargei. rowly car-shapcd, coutractcd by a strong linguiform 

 tooth extending along the entire parietal wall; peristome callous, some- 

 what 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 diameter 12J, lesser 10"""; height, 6^""'. 



Helix lairosa, Bland, Anu. N. Y. Lyc.vii, 430, pi. iv, fig. 19 (1861). — W. G. Bixney, 



L. & Fr.-W. Sh., i, Hi (1869). 

 Sienotrema lahrosa, Tryon, Am. Journ. Conch., iii, 59 (1867). — W. G. Binney, Terr. 



Moll., V, 292. 



A species of the Cumberland Subregion, ranging southerly into Ala- 

 bama, southwesterly into Arkansas. 



The thickened and reflected peristome and deep, wide notch suffi- 

 ciently distinguish labrosum from Edgarianum. The notch in the latter, 

 situated in the center of the aperture, as in stenotremum, is, in a meas- 

 ure, obsolete; but in lahrosum it is strongly developed and nearer to 

 the outer edge'of the peristome, as in liirsutum. The form of the pa- 

 rietal tooth of this species is like that of hirsutum, while Edgarianum 

 is in that particular more like stenotremiim. Edgarianum^ in fact, con- 

 nects stenotremum with spiriosum, but labrosum is rather allied to Jiirsu- 

 tum, and in the character of the iieristome to maxillatum. 



Jaw with 12 ribs. Lingual membrane with 35-1-35 teeth, 12 of which 

 are laterals (Terr. Moll., Y, Plate XVI, Fig. T). 



Genitalia as in monodon. 



Steuotreiiia Edg'arianum, Lea. 

 Shell imperforate, lenticular, carinated, solid, arcuately striate, under 

 Fig. 291. the epidermis yellowish flesh-color, with distant, short, 

 prostrate hairs ; spire convex-conoid, rather obtuse; whorls 

 5, flattened, the last anteriorly deflected, subconstricted ; 

 ai)erture very oblique, most narrowly ear-shaped, narrowed 

 by a stout, tongue-shaped, arcuatelv entering tooth on the 



S. Edgarianum, "^ 7 & i 5 - o 



enlarged. f^^\\ length of the parietal wall ; jieristome subcontinuous. 



