POLYGYRA. 277 



showing 1^ whorls, and ending in a narrow umbilicus; aperture subreniform, 

 very oblique, contracted ; peristome white, thickened, not reflected, continuous, 

 its terminations approached, joined by a prominent, excavated, 

 heavy, somewhat flexuose, emarginate, tongue-like callus, pro- 

 jecting almost across the aperture ; within the columellar mar- 

 gin of the peristome is an erect, blunt, stout denticle (its inner 

 end continued back within the aperture into an erect lamella 

 joining the inner wall) somewhat overlapping and thus partially 

 concealing from view a smaller, more deeply seated, erect, ob- 

 tuse, stout denticle on the right margin of the peristome ; an internal trans- 

 verse tubercle on the base of the shell. Greater diameter 7, lesser 6 mill. ; 

 height, 3 mill. 



Polygyra plicata, 1 SAY, Journ. Acad. Phila., II. 161 (1821) ; ed. BINNEY, 21. 



Helix fatigiata, BINNEY in Bost. Journ. Nat. Hist., III. 388 (1840), part (excl. 

 syn. and fig.); in Terr. Moll, part (excl. syn. and fig.). 



Helix Texasiana, PFEIFFER, Hon. Hel. Viv., I. 418 (excl. syn. and descr.) ; in 

 CHEMNITZ, I. 85 (excl. syn., descr., and fig.). 



Helix Dorfeuilliatta, DESHAYES in FER., I. 73 (excl. descr., syn., and fig.). 



Helix Troostiana, PFEIFFER, Mon. Hel. Viv., IV. 318, part. 



Helix Hazardi, BLAND, Ann. N. Y. Lye., VI. 291, PL IX. Figs. 27-30(1858). 

 -PFEIFFER, Mai. Blatt, 1859, 34. W. G. BINNEY, Terr. Moll., IV. 84, PI. 

 LXXVIII. Fig. 13. L. & Fr.-W. Sh., I. 99 (1869). 



Helix finitima, DESHAYES in FER. ? 



Hclicina plicata, DfiKAY, N. Y. Moll., 82 (1843). 



Dccdalochila Hazardi, TRYON, Am. Journ. Conch., III. 68 (1867). 



Alabama (Tuscumbia), Kentucky (near Frankfort), Georgia, and Tennes- 

 see (Cumberland Mountains). A species of the Cumberland Subregion. 



Animal small, smoky-white ; head and eye-peduncles dark blue. 



This shell may be distinguished from fastigans and Troostiana, independently 

 of the absence of the carina, by its smaller size, and more particularly by the 

 different form, relative size, and position of the teeth. In those species the 

 superior tooth on the peristome is transverse, compressed, and larger than the 

 inferior one, from which it is separated by a "remarkable sinus," distinctly 

 visible on looking into the aperture ; the inferior tooth is obtuse. Immedi- 

 ately behind the peristome, the position of the teeth is marked by small shal- 

 low pits, giving the character to the last whorl designated by Shuttleworth 

 " scrobiculato-constrictus," and the striae run over the whorl up to the peristome. 

 In Haznrdi the two teeth within the peristome are of the same character as 

 the superior one in fasligans and Troostiana ; the inferior tooth is, however, 

 the larger, and so partially conceals the lower margin of the superior one as 

 to obstruct the view into the aperture, and give no appearance of separation 

 "by a remarkable sinus." Both the teeth are more deeply seated than in the 

 other species. The nature of the scrobiculation behind the perjstome in 7/a- 



l By the strict laws of priority this name should be used, not being preoccupied ia 

 Polygyra. 



