280 A MANUAL OF AMERICAN LAND SHELLS. 



T. i)\flecta (Terr. iMolL, V, Plate VII, Fig. S) lias 22-1-22 teeth ou its 

 liiignal niciiibrnTic; 7 perft-ct laterals on each side. This and the fol- 

 lowing species have inner margimil teeth, with siiuple, not bifid, out- 

 ing- points (c). It was bifid in the twenty -first tooth of one specimen 

 examined, simple in the twenty-second, and bifid in the twenty-third 

 and all beyond. There were over 2o-l-23 teeth on this membrane. 



Genitalia as in T. Rugeli 



Ti'iodopsis Bu§:eli, Shuttleworth. 



Shell imperforate, orbicularly convex, with granulate striations and 



Fig. 311. few hairs, waxen horn-color ; spire short, obtuse ; whorls 



5i, rather convex, the last suddenly falling in front and 



strongly contracted at the aperture; aperture depressed, 



narrowed by a tongue-shaped, flexuose, strong parietal 



denticle ; i^eristome reflected, within thickened, its right 



termination with a large, obtuse, very deeply seated 



eiihii'ged.' tooth (whose position is marked ou the exterior of the 



shell by a groove or pit), the basal terminus furnished with a smaller, 



transverse, submarginal denticle. Greater diameter 13, lesser 11^"""; 



height, 61"™. 



Helix Rugeli,- ^n\]TTl.^yfORTii, Bern. MittheiL, 1852, 19S.— Pfeiffek, Mou. Hel.Viv., 

 iii, 268.— Gould, iu Terr. Moll., iii, IS.— W. G. Binxey, Terr. Moll., iv, 60, 

 pi. Ixxviii, fig. 15; L. & Fr.-W. Sh., i, 129 (1869).— Bland, Am. N. Y, Lye, 

 vij, 426. 



Isoynomostoma Rugch, Tryox, Aui. Journ. Concli., iii, 55 (1867). 



Triodopsis llugeli, W. G. Binney, Terr. Moll., v, 307. 



Tennessee; North Carolina; Whitley County, Kentucky. A species 

 of the Cumberland Subregion. 



It is in most respects similar to the i)receding species, and would be 

 mistaken for it unless the aperture be examined. The position of the 

 upper tooth of the peristome far within the aperture' at once dis- 

 tinguishes it. The size is not, however, any criterion, as I have in- 

 dividuals of Rugeli only 10""" in diameter, while some of my specimens 

 of injlecta are full 13""". 



The figure shows an enlarg(id view of the aperture. 



Animal externally resembling that of T. inflecta. 



Jaw as usual ; about 10 ribs. 



Lingual membrane (Terr. Moll., V, Plate VII, Fig. K) has 21-1-21 

 teeth ; 6 perfect laterals. The inner laterals (eighth to tenth tooth) 

 have a simple inner cutting point; beyond Ihis it is bifid. 



Genitalia (Terr. Moll., V, Plate XV, Fig. E) generally resembling 



