EASTERN PROVINCE INTERIOR REGION SPECIES. 2G9 



5^, flattened, tlie last more convex, descending at tlie aperture, grooved 

 behind the peristome, "vrith a smoother bulge, below plane, widely ri- 

 mated, and ending in a small umbilicus j aperture oblique, ^10.286.- 

 subreniform, very much contracted, f;ir within on the base 

 of the outer whorl, with a small, detached, erect, rounded 

 tubercle; peristome white, thickened, continuous, ends ap- 

 proached, joined by an excavated, emarginate, somewhat 

 flexuose, slighty entering, tongue-like, heavy callus, the 

 basal margin with a submarginal, obtuse, stout denticle, 

 ri.aht margin with a more deeply seated, broader denticle. ^- Troostiana, 

 Greater diameter 9, lesser 8""" ; height, 3'""". 



rolygi/7-a Troostiana, Lea, Tr. Ara. Phil. Soc, vi, 107, pi. xxiv, fig. 119; Obs., ii, 107 



(18:59).— TrOschel, Arch. f. Nat., 1839, iii, 222. 

 Helix Tronstiana, Pfeiffeu, Mou. Hel. Viv., i, 419, excl. syn. et var. ; in Chemnitz, 



ed. 2, i, 376, pi. Ixv, figs. 21-24.— Deshayes, iu Fer., i, 75, pi. Ixis, D, fig. 4?— ' 



Eeeve, Con. Icon., No. 706 (1852).— W. G. Binney, Terr. Moll., iv, 88, pi. 



ixxviii, tig. U.— L. iS:. Fr.-W. Sh., i, 98, fig. 175 (1869).— Bland, Ann. N. Y. 



Lye, vi, 288, pi. ix, figs. 21-23 (1858). 

 Selix fatigiata, Binney, Bost. Jonrn. Nat. Hist., iii, 388, pi. xix, fig. 3, part, excl 



syn. ; in Terr. Moll., part ii, 193, pi. xxxix, fig. 2. 

 Uelix pUcaia, Binney (not of Say), Terr. Moll., pi. xxxix, fig. 2, uot text. 

 DifdaJochUa Troontiana, Tryon, Am. Jonrn. Conch., iii, 67 (1867). 

 Polygyra Troostiana, W. G. Binney, Terr. Moll., v, 275. 



Murfreesborough and Franklin County, Tennessee; Kentucky. A 

 species of the Cumberland Subregiou. 



P. Troostiana is very closely allied to F. fastigans, from which I sep- 

 arate it with some hesitation. In its fresh state it has a thin, sparingly 

 hirsute epidermis. I have, moreover, two specimens in my cabinet (both 

 hirsute) which are as acutely carinated ^s fastigans, with the strise as 

 l^rominent below as above (in one more numerous), but both having the 

 parietal tooth of Troostiana. 



I am not altogether satisfied with the validity of Shuttle-worth's re- 

 mark that the superior tooth in fastigans is larger and more consi^icu- 

 ous than in Troostiana. 



This species has the same tubercle within the last whorl us fastigans. 



Jaw as usual iu the subgenus Polygi/ra, with about 10 broad, crowded 

 ribs, denticulating either margin. 



P. Troostiana (Terr. Moll., V, Plate VI, Fig. D) has 25-1-25 teeth, 

 with 8 laterals on its lingual membrane. 



* The figure does not show the hirsute character of the shell. 



