EASTERN PROVINCE INTERIOR REGION SPECIES. 307 



Helix elcrafa, Say, Journ. Acad. Pliila., ii, 154 (1821); Amerirau Concliolo^y, No. 4, 

 pi. xxxvii, fig. 2 (1H:52) ; Binney's ed.,27, pi. xxxvii, fig. 2; ed.CnENi', ISilil. 

 Concli.. iii, 4S, pi. xiii.fig. 2, a. — Binnky, Host. Jomu. Nat. Iliwt., i, 4ii(i, pi. 

 xix (lti37); Terr. Mol .,ii,126, pi. iv.— Leidy, T. M. U. S., i, 256, pi. x. ligs. 

 4,5 (I851),aiiat.— De Kay,N. Y. Moll., 36,i)l. iii,lig. 20 (184:i).— Mks. Gray, 

 Fig. Moll. An., pi. cxci, tig. 7, no descr. — Pfeikfeu, Syuib. Hist. Hel., ii, 27; 

 Mon. Hel. Viv.,i,317; in Chemnitz, ed. 2, i, 56, pi. vii, figs. 11 12 (1846).— 

 Reeve, Coil. Icon., No. C81 (1^52).— Desiiayes, in FliiR ,i,329. 



Helix TeniiefibCivsis, EEA,T]aus. Am. Phil. Soc., ix, 1; Obs., iv, I (1844); Proc.,ii, 31 

 (1841) ; Tkoschel's Arcli. f. Nat., 1837, ii, 124. 



Helix ^Hoxri7Zi«»rt, Fekussac, Hist., pi. xlix,tigs. 5,6. 



Xolotrema elivata,Tn\'0'S, Am. Jonru. Concb., iii, 48 (1867). 



Mesodon elevata, W. G. Binney, Terr. Moll., v, 324. 



A Post-pliocene species, now found in the Interior Kegion, from 

 Georgia (on the banks of the Tennessee Kiver) to Wisconsin, from 

 New York to Missouri ; not east of the Allegiianies. 



Animal ashy brown on tbe upper surface, lighter on the posterior 

 extremity and sides ; mantle grayisb-wbite; glands prominent and dis- 

 tinct. (See Bost. Journ. Isat. Hist., I, Plate VIII.) 



There is a form furnished with a brownish, revolving band upon the 

 body-whorl, found in Eastern Tennessee. 



Jaw as usual in the genus; over 12 ribs. 



Lingual membrane (Terr. Moll., V, Plate VIII, Fig. M) with about 

 45-1-45 teeth; 17 laterals; the eighteenth tooth having its inner cut- 

 ting i)oint bifid. 



Genitalia (see Terr. Moll., I, I. c): Penis sac long, stout, cylin- 

 drical, receiving retractor muscle and vas deferens at its summit; 

 genital bladder long, rounded^ stout, gradually and obtusely attenu- 

 ated above, with a short duct. 



Mcsodoii Clarkii, Lea. 



Shell imperforate, globosely rounded, regularly and finely striated, 

 reddish born-color; spire obtusely conic; whorls 7, fig.329. 



convex, with delicate incremental strite, the last one 

 very globose and rounded below; aperture lunate; 

 peristome white, thickened, reflected, its basal termi- 

 nation quite heavy and covering the umbilicus en- 

 tirely; one elongated, white denticle on the parietal 

 wall of tbe aperture. Greater diameter 14, lesser 

 13"""; height, 9""". ,__ 



Helix Chirkii, Lea, Proc. Acad. Nat. So. Philad., 1858, 41; J^ ( ; oAm . nlu^ed. 



Journ., — ; Obs., xi, 138, pi. xxiv, fig. 111. — W. G. Binxky, Terr. Moll., iv, 53, 



pi. Ixxvii, fig. 10; L. & Fr.-W. Sh., i, 143 (1869). 

 Xolotrema Clarkii, Tkyon, Am. Journ. Couch., iii, 48 (1867). 

 Mesodon Clarkii, W. G. Binxey, Terr. Moll., v, 324, 



