283 



LAND AND FRESH-WATER SHELLS OF N. A. [PART L 



with a testaceous deposit within ; peristome thin, acute, straight, ex- 

 tremities approaching, its lower extremity inserted 

 Fig. SIS. juto the centre of the base, and somewhat reflected ; 



base smooth, perforate. Greater diam. IS, lesser 15 ; 

 height 9 mill. 



Helix hevifjata, Pfeiffer, Mon. Hel. Viv. I, 64; III, 

 67 (excl. syn.) ; in Chemkitz, ed. 2, II, 106, pi. 

 Ixxxiv, f. 17-19 (excl. syn.). — Reeve, Con. 

 Icon. no. 672 (1852) ?— Deshayes in Fek. I, 94, 

 pi. ixxxii, f. 6.— W. G. BixxEY, Terr. Moll. IV, 

 106.— Bland, Ann. N. Y. Lye. VII, 119 (excl. 

 syn. inornata). 

 Helix luciihrata, Bixkey, nee Say, Terr. Moll. 11,225^ 



pi. xxxii. 

 Helix fill iijinosa, Binney, in Bost. Journ. (pars, excl. 

 descr., syn., et fig.), 1840. 

 Helix inornata, Reeve, /. c. 666, not Say. 

 Hyalina laevigata, Tryon, Am. Journ. Conch. II, 247, pi. iii, f. 12 (1866). 



From Pennsylvania to Florida ; from Arkansas to Illinois. 



The shell described and figured above is well known 

 in collections, and can be confounded with no other 

 now known. It has, however, been peculiarly un- 

 fortunate in its synonymy, as a reference to the fourth 

 volume of the Terrestrial Mollusks and the seventh 

 volume of the New York Lyceum Annals will show. 



A more globose variety is figured. 



Zonites Icevigata. 



Fig. 516. 



Fig. 517. 



Zonites stibplana, Bikney. — Shell flattened, planulate above and 

 beneath ; epidermis brownish or smoky horn-color, 

 shining ; whirls five and a half, those nearest the apex 

 striated transversely with very minute and delicate 

 wrinkles; suture distinct, not much impressed; aper- 

 ture transverse, not expanded, the plane of the aperture' 

 making nearly a right angle with the plane of the base of 

 the shell ; peristome simple, thin, acute ; base flattened, 

 umbilical region a little impre.ssed ; umbilicus small, 

 round, and deep, not exhibiting the volutions. Greater 

 diam. 20, lesser 16 ; height 6 mill. 



Helix suhplana, Bixxey, Bost. Journ. Nat. Hist. IV, 

 Zonites subxjtana. part 1, cover, p. 3 (1S42) ; IV, 241 (1842) ; Terr. 



