218 A MANUAL OF AMERICAN LAND SHELLS. 



trial Mollusks, aud Annals of New York Lyceum, quoted above. See 

 also below, under Z. cellarius. 



I have in my collection a curious specimen from the Pennsylvania 

 mountains, in which are three well developed, sharp, tootb-like processes 

 on the internal thickened margin of the peristome. 



My largest specimen has a greater diameter of 22™™. 



Jaw strongly arcuate, ends rapidly attenuated, anterior surface 

 striated, concave margin smooth, with an acute median projection. 



Lingual membrane with 37 rows of 23-1-23 teeth each; centrals 

 long, slender, tricuspid; only 2 perfect laterals, stouter, bicuspid; 

 marginals aculeate. Another membrane had 23-1-23 teeth. Another 

 had 27-1-27 teeth, with 29 transverse rows. The transition teeth are 

 peculiar in their base of attachment (Plate II, Fig. H, of Terr. Moll., V). i 

 There are scarcely any perfect lateral teeth. 



The genitalia have the same general arrangement as in Z. friabilis, 

 already described. The ovary, however, is very much more developed, 

 being in this species the most conspicuous organ in the system ; the 

 epididymis is less convoluted, the oviduct is longer, the vagina shorter, 

 the genital bladder more clavate, with a shorter duct, and there is a 

 small, globular, vaginal prostate (Terr. Moll., V, Plate XI, Fig. C). 



Zonites sculptilis, Bland. 



Shell scarcely perforate, suborbicular, depressed, subpellucid, pale 

 horn-color above, of lighter shade beneath, shining, with regular, sub- 

 FiG.231. equidistant, impressed transverse lines, those on the last | 

 whorl extending over the periphery and converging in the 

 umbilical excavation ; spire very little elevated, scarcely con- 

 vex ; whorls 7, i^lanulate, the last rapidly increasing, equal 

 at the aperture to one-third the diameter of the shell, beneath 

 flattened and little excavated in the umbilical region ; suture 

 lightly impressed ; aperture scarcely oblique, depressed, trans- 

 verse, lunate; peristome simple, acute, sinuate, the columellar margin 

 very rapidly and narrowly reflected over and almost entirely covering 

 the very small perforation. Greater diameter 12^, lesser llm™ ; height, 



rjinra 



C^ 



Helix sculptilis, Bland, Ann. N. Y. Lye, vi, 279, pi. ix, fige. 11-13 (1858).— W. G, 

 BiNNEY, Terr. Moll., iv, 110, pi. Ixxvii, fig. 15. -Pfeiffer, Mill. BUitt., 1859, 5, 



Eyalina sculpUlis, Tryon, Am. Jonrn. Conch., ii, 249 (l-'OC)). — W. G. Binney, L. &, Fr.- 

 W. Sh., i, 290 (1809). 



Zonites sculptilis, W. G. Binney, Terr. Moll., v, 110. 





