EASTEKN PROVINCE INTERIOR REGION SPECIES. 209 



direction, however, its rauge is greatest, as I have traced it to the Hot 

 Spriugs of Arkansas, and to Washington County, Texas. 



Animal bluish slate-color. The caudal pore, locomotive disk, and 

 longitudinal furrows above the edge of the foot are all present. 



Jaw as usual in the genus. 



Lingual membrane similar in type to that above described of Z. cap- 

 nodes. Teeth about 57-1-57, with 6 perfect laterals (Terr. Moll, V, Plate 

 II, Fig. J). 



The genital system is figured in Terr. Moll., V, Plate XI, Fig. D. The 

 ovary is stout, light brown, and blunt. The oviduct is short. The vagina 

 is long and narrow, with a yellow prepuce-like expansion (pp) at the en- 

 trance of the duct of the genital bladder, which is near the base. The 

 genital bladder is large, oval, on a duct of about equal length and size 

 as the vagina. The penis sac is long and slender, and peculiarly char- 

 acterized by a lateral bulbous expansion near its base, bearing the 

 retractor muscle. Beyond this bulb the sac is narrow, but gradually 

 expands, and towards its end again very gradually tapers towards the 

 apex, where the vas deferens enters. Its orifice is side by side with 

 that of the vagina. The external orifice of the system is under the 

 mantle. I found no dart in the buib-like organ attached to the penis 

 sac. It probably is a form of prostate. It is found in the allied species. 



The Texas specimens have a much thicker shell than those from 

 Illinois, so as not to deserve the specific name. 



Zonites laevig^attis, Pfeiffer. 

 Shell somewhat convex, oftener depressed ; epidermis greenish horn- 

 color, shining, thin ; whorls 5, rather flattened, rapidly fig. 220. 

 enlarging, with beautiful and regular oblique strife and 

 revolving microscopic lines, the last whorl expanding 

 towards the aperture, not descending; aperture trans- 

 verse, broadly lunar, ample, with a testaceous deposit 

 within ; peristome thin, acute, straight, extremities ap- 

 proaching, its lower extremity inserted into the center 

 of the base and somewhat reflected ; base smooth, per. 

 forate. Greater diameter 18, lesser 15™™ ; height, 9'"™. zonites icevigatus. 



Helix Iwvigata, Pfeiffer, Mod. Hel. Viv., i, 64; iii, 67 (excl. syu.); in Cuemnitz, 

 etl. 2, ii, 106, pi. Ixxxiv, fig. 17-19 (excl. syn.).— Reeve, Con. Icou., No. 672 

 (1852)?— Deshayes, in Fdr., i, 94, pi. Ixxxii, fig. 6.— W. G. Binney, Ter. 

 Moll., iv, 106. — Bland. Ann, N. Y. Lye, vii, 119 (excl. syu. inornata). 



Helix hicubrala, Binney, ncc Say, Terr. Moll., ii, 225, pi. xxxii. 



Helix fuliginosa, Binney, iu Best. Jonru. (pars, excl. descr., syn., ct fig.), 1840. 

 1749— Bull. 28 14 



