Fijr. 173. 



274 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



tate ; within the base of the last whorl is a small, detached, erect, rounded 

 tubercle ; peristome white, reflected, its terminations joined by 

 a stout, subtriangular, excavated, deeply entering tooth, the 

 right-hand margin with a stout, deeply seated tooth, the colu- 

 mellar margin with a submarginal smaller tooth. Greater diam- 

 eter 10, lesser 9 mill.; height, about 4 mill. 



Polygyra fatigiata, Say, 1 N. Harm. Diss., II. 229 (1829) ; ed. Bin- 

 ney, 37. 



Helix fatigiata, Binney, in Bost. Journ. Nat. Hist.," III. 388 

 (1840), ex parte (excl. syn. et Fig.) ; Terr. Moll., II. 193 (pars), 

 PL XXXIX. Fig. 4 (excl. syn.). — Shuttlewortii, Bern. Mitt., 

 D 7 1852, 197. — Bland, N. Y. Lye, VI. 283, PI. IX. Figs. 17- 



P. fastigans. ' J ' ° 



20 (1858). — W. G. Binney, Terr. Moll., IV. 82; L. & Fr.- 



W. Sh., I. 97, Fig. 173 (1869). — Pfeiffer, Mon. Hel. Viv., IV. 318. 

 Helix Tcxasiana, j3, Pfeiffer, Mon. Hel. Viv., I. 418 ; III. 2fi7 ; in Chemnitz, 



ed. 2, I. 86, exed. descr., syn., et fig. — Deshayes in Feb., I. 74, excl. descr., 



syn., et fig. 

 Helix Dorfeuilliana, Deshayes in Fer., I. 73 (excl. syn.), PI. LXIX. D, Fig. 3, 



not of Lea. 

 Helicina fastigiata, DeKay, N. Y. Moll., 82 (1843). 

 Helix fastigans, L. W. Say, MS. in Bland, Ann. N. Y. Lye, VII. 140. 

 Dazdalochila fastigans, Tryon, Am. Journ. Coneh., III. 67 (1867). 



A species of the Cumberland Subregion, found in Tennessee at Clarkeville 

 and Nashville and in Franklin County, in Kentucky in Henry County. 



P. fastigans is larger than Troostiana, Hazardi, and Dorfeuilliana ; it is most 

 nearly allied to the first, and though it is connected with the second, is wholly 

 distinct from the last. The parietal tooth is more rectangular than that of 

 Troostiana, in which it is slightly emarginate near the tip, but much more so 

 in Hazardi, while the parietal tooth in Dorfeuilliana is rather quadrate. The 

 teeth on the peristome in fastigans and Troostiana are much alike, as regards 

 form, size, and position, the superior one being the largest ; both are larger 

 and transverse in Dorfeuilliana and in Hazardi, the inferior one being the 

 largest in the latter. Behind the peristome there are two small pits, showing 

 the situation of the teeth in fastigans and Troostiana, while there is scarcely 

 more than a deep, well-marked constriction in Dorfeuilliana. H. Troostiana 

 has a slight groove on the inner side of the last whorl, the absence of which in 

 .fastigans is noticed by Say; but I scarcely consider that a good specific charac- 

 ter. Fresh specimens of fastigans are, I believe, covered with a very thin epi- 

 dermis, on which hairs are sparingly scattered, — the scars of the hairs may be 

 detected, especially on the last whorl, in denuded shells. 



P. fastigans has, at a short distance within the aperture on the base of the 

 last whorl, a small, detached, erect, rounded tubercle, answering probably the 



1 This name, or rather fastigiata, for which it was intended, is not preoccupied in 

 Polygyra. 



