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, subtrianguhir, excavated, deeply enterinj^ 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. 



Pohjgyra fatigiata, Say,i 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), 



PI. XXXIX. Fig. 4 (excl. syn.). — Shuttlewouth, Bern. Mitt, 



Ffasiisans ^^^2, 197. - Bland, N. Y. Lyc, VI. 283, PI. IX. Figs. 17- 



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



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



Helix Tcxasiana, p, Pfeiffer, Men. Hel. Viv., I. 418 ; III. 267 ; in Chemnitz, 



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



syn., et fig. 



Helix DorfeuilUana, Deshayes in F^r., I. 73 (excl. syn.), PI. LXIX. D, Fig. 3, 



not of Lea. 

 Helicinafastigiata, DeKay, N. Y. MolL, 82 (1843). 

 Helix fastigans, L. W. Say, MS. in Bland, Ann. N. Y. Lyc, VIL 140. 

 Dcedalochila fastigans, Tryon, Am. Journ. Conch., 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, Hazardij and DorfeuilUana; 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 

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

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

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

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

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

 laro-est in the latter. Behind the peristome there are two small pits, showing 

 the situation of the teeth in fastigans and Ti'oostiana, while there is scarcely 

 more than a deep, well-marked constriction in DorfeuilUana. H. Troosliana 

 has a sli'^^ht croove 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.fastigatis 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. 



