374 A MANUAL OF AMERICAN LAND SHELLS. 



EeUx oppilata, Moricand, Test. Novi8s.,i,8. — Pfeiffer, Mon. Hel. ■Viv.,iii,264 ; iv, 

 :i]4.— W. G. BiNNEY, L. & Fr.-W. Sh., i. lOl.fig. 177 (1869).— Fischer and 

 Crosse, Moll. Mex.et Guat.,-^87 (1870). 



Polygyra oppUaia, W. G. Binney, Terr. Moll., v, 278. 



The specimen figured is from Yucatan ; Pfeiffer, on Shuttle worth's 

 authority, refers to Florida a var., /5, with a somewhat more elevated 

 spire, 5i whorls, and 8§""" in the greater diameter. The specimen dis- 

 sected by me is from Cedar Keys. 



The above figure is referred to implicata, Beck, by Crosse and 

 Fischer, I. c. 



Lingual membrane (Terr. Moll., Y, Plate XVI, Fig. D) as usual in 

 the geuus. The inner marginals have simple, not bifid, cutting points. 



Polyg:yra Dorfeuilliaiia, Lea. 

 Shell rimately umbilicated, discoidal, slightly convex above, flat- 

 tened below, light horn-colored, striated, below smoother and with mi- 

 FiG. 410. ^'^te revolving lines; spire not much elevated; whorls 6, 

 flattened, gradually increasing, the last more convex, inflated 

 below, constricted behind the peristome, descending at the 

 aperture, below with a grooved rimation of 1^ whorls, ending 

 in a very small umbilicus; aperture oblique, subreniform, 

 p. Dor/euii- coutractcd, far within furnished with ti deeply seated, erect 



liana, eu- 



larged. tuberclc OH the base of the last whorl ; peristome white, very 

 much thickened, not reflected, continuous, its terminations but slightly 

 approached, joined by a heavy, excavated, subquadrate callus project- 

 ing across the aperture, the columellar margin with a deeply seated, 

 transverse, somewhat pointed denticle, distinctly separated from a 

 broader, equally deeply seated obtuse denticle on the right margin. 

 Greater diameter 8, lesser 7"""; height, 3^""". 



Polygyra Dorfeuilliana, Lea, Trans. Am. Philo. Soc, vi, 107, pi. xxiv, fig. 118; Obs., il, 



107 (1839) ; Tuoschel's Arch. f. Nat., 1839, ii, 222.— W. G. Binney, Terr. Moll., 



V, 278. 

 Helix DorfcuilUana, Bland, Ann. N. Y. Lye. (18.'>8),vi, 294, pi. ix, figs. 24-2G.— W. G. 



Binney, Terr. Moll., iv, 86, pi. Ixxviii, figs. 2, 14 ; L. & Fr.-W. Sh., 1, 101, not 



of Pfeiffer, Deshayes, Chemnitz, Reeve. 

 Helix fatujiaia, Binney, Bost. Journ. Nat. Hist., iii, 388 (1840); Terr. Moll., ii, 193 



(excl. descr., syn., and fig.). 

 Helix Troostiana, var.? Pfeiffer, Mon. Hel. Viv., iii, 318, no descr. 

 Dmlalochila Dorfeuilliana, Tkyon, Am. Journ. Conch., iii, 66 (1867). 



Washington County, Texas ; Wa'-^hita Springs, Ark. ; Coosa River, 

 Alabama; Kentucky, opposite Cincinnati. It thus appears much 

 more widely distributed than the allied species, perhaps enough so to 

 be considered a species of the Interior Region. Mr. J. G. Anthony 



