226 A MANUAL OF AMERICAN LAND SHELLS. 



Eelix gularis, var. /?, PfeifFer, iu Chemnitz, ed. 2, &c. See Z. gularis. 



Gastrodonla »«jjjj>'essa, Tryon, Am. Journ. Couch., ii, 258 (1866). 



Zonites supjiressa, W. G. Binney, L. & Fr.-W. Sh., i, 293 (1869).— Gould and BiN- 



NEY, Invert of Mass., ed. 2, 454 (1870). 

 Zonites svppressus, W. G. Binney, Terr. Moll., v, 130. 



I have considered this as a species of the luterior Eegion, which has 

 passed those limits, ranging into the Northern and Southern Eegions. 

 I have actually received it from New England to Florida and to Mich- 

 igan. 



Animal: seep. 223, and Bost. Journ. of Nat. Hist., Ill, Plate XI, Fig. 3. 



This shell does not correspond exactly with Say's description, but I 

 think it is the same that he described under this name. Having re- 

 ceived, from different localities, suites of them, of different sizes, I 

 notice that the "umbilicus small, orbicular, profound," of Say, exists 

 usually only in young specimens, it being oftener closed in the full- 

 grown shell, but not always so. 



It*resembles the preceding species, but has one whorl less, is more 

 depressed, and its base is more convex. The tooth in the aperture is 

 sometimes so little prominent as to be hardly visible; at other times 

 there are 3 teeth. The striie of growth are fine and crowded, and seem 

 to be more nearly at right angles with the suture than is usual in other 

 species. 



Jaw strongly arcuate, ends rounded, concave margin smooth, with 



Fig. 242. a stout, rouudcd, blunt median iirojectioii. 



^^ Z. suppressus (Terr. Moll., Y, Plate III, Fig. J ; the mar- 



Jaw of zonitfs giuals are from near the edge of the membrane) has 30-1- 



(Leid.v.) 30 teeth, with 8 perfect laterals on each side on its lingual 

 membrane. 



The genitalia are figured by Leidy (/. c.) as iu Z. intertextus (see 

 above). I have already, under Z. ^wiam, pointed out the specific dis- 

 tinction between that species and suppressus, furnished by the genital 

 system, 



Zonites ciispidatiis, Lewis. 



Fig. 213. Fig. 243 represents the form of Z. gularis which is called by 



Dr. Lewis Z. euspidatus. The internal tooth-like processes, 

 strongly curved one towards the other form, almost an 

 arched sjiace. The umbilicus is entirely closed. It is found 

 in Monroe County, Tennessee, and on Eoan Mountain, Mitch- 

 ell County, North Carolina. It is a species of the Cumber- 

 z. euspidatus. ],^jj(^i Subregion. 



