328 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



tooth-like tubercle ; peristome acute, rose-colored, equally angularly reflected, 



appressed at the columella. Greater diameter 14, lesser 12 mill. ; 

 Fig. 211. height> 7 miU 



Helix Wheatleyi, Bland, Ann. N. Y. Lye, VII. 118, PI. IV. Fig. 



19 (1860). — W. G. Binney, L. & Fr.-W. Sh., I. 145 (1869). 

 Mesodon Wheatleyi, Tryon, Am. Journ. Conch., III. 40 (1867). 



Mountains in Cherokee County and at Hayesville, North Caro- 

 lina. It may prove a species of the Cumberland Subregion. 

 Jaw as usual in the genus, with about 12 ribs. 

 M. Wheatleyi. Lingual membrane long. Teeth about 67 — 1 — 67, with over 

 12 laterals. Centrals and laterals as usual in the genus. Mar- 

 ginals high, narrow, with one very long cutting point to the single cusp. Outer 

 marginals about as high as wide, with one long inner, obtusely pointed, cutting 

 point, and one shorter, outer cutting point. The first marginal teeth resemble 

 those of thyroides in the single, greatly produced cutting point. The extreme 

 marginals, however, are bifid. (PI. VIII. Fig. R.) 



The genital system in the specimens received was too decayed to allow of 

 complete examination. The penis sac, however, was in perfect condition. It 

 forms the peculiar feature of the system on account of its enormous develop- 

 ment. It is short, cylindrical, with blunt ends, very stout, three or four times 

 as large as the oviduct, with retractor muscle and vas deferens at its apex. 



Mesodon dentifera, Binney. 



Vol. in. PI. XII. 



Shell imperforate, flattened-convex on the upper surface, convex below ; 

 epidermis yellowish horn-color, immaculate ; spire depressed ; whorls 5, with 

 delicate, parallel, oblique stria? ; suture distinct, not deeply impressed ; aper- 

 ture contracted by the peristome, flattened towards the plane of the base ; 

 peristome thickened, white, broadly and abruptly reflected ; parietal wall with 

 a prominent, white, tooth-like process nearly parallel with the lower margin of 

 the aperture, not projecting towards the umbilicus; base convex. Greater 

 diameter 23, lesser 18 mill.; height, 10 mill. 



Helix dentifera, Binney, Bost. Journ. Nat. Hist., I. 494, PI. XXI. (1840) ; Terr. 

 Moll., II. 134, PI. XII. — Adams, Vermont Mollusca, 159 (1842). — Pfeiffer, 

 Mod Hel. Viv., I. 317. — W. G. Binney, Terr. Moll., IV. 55 ; L. k Fr.-W. 

 Sh., I. 145(1869). — DeK ay, N. Y. Moll., 34, PI. II. Fig. 17 (1843). — Mrs. 

 Gray, Fig. of Moll. Ann., PI. CXCI. Fig. 11, no descr. (from Bost. Journ.). — 

 Morse, Amer. Nat, I. 99, Figs. 6, 7 (1867). — Gould and Binney, lav. of 

 Mass., ed. 2, 424 (1870). — Pfeiffer, Mon., V. 429 (1868). — Not of Pfeiffer, 

 Vol. III. — Not of Chemnitz, ed. 2 (= Ro'emcri). 



From Maine to Virginia and to Ohio. It prefers mountainous country. It 

 may be considered a species of the Northern Region, ranging into the Interior 

 Region, especially along the Appalachian chain. 



