. Bulletin - United States National Museum. Science. 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- ,eniargei. rowly car-shapcd, coutra
. Bulletin - United States National Museum. Science. 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- ,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. , 430, pi. iv, fig. 19 (1861).—W. G. Bixney, L. & 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
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
