ZONITES. 109 



edges of the foot, and uniting above and before its posterior termination. Be- 

 hind the junction is a prominent, longitudinal, bluish-white mucus pore, on the 

 extremity of the foot. A distinct locomotive disk. 



I have received specimens from the mountainous regions of North Carolina, 

 Kentucky, Tennessee, Virginia, Maryland, Pennsylvania, into the western part 

 of New England ; and from the States bordering on the Great Lakes. It may 

 therefore be said to inhabit the Interior Region and the more elevated parts of 

 the Northern Region. It was living in Post-pleiocene days. 



Plate XXXIV. represents the usual form of the species. A more globose 

 form is figured in Fig- 27. It was found in the mountains Fig. 27. 



near Ashville, Buncombe Co., N. C, by Dr. Ravenel. 



The shell which is described above is well known in col- 

 lections, and not easily confounded with any other. It has 

 been unfortunate in its synonymy, whose history is treated 



•>*'>' •> Zonites mornalus, 



at length and explained in the fourth volume of the " Ter- Tar< 



restrial Mollusks" and "Annals of New York Lyceum" quoted above. See 

 also below, p. 113. 



I have in my collection a curious specimen from the Pennsylvania mountains, 

 in which are three well-developed sharp tooth-like processes on the internal 

 thickened margin of the peristome. 



My largest specimen has a greater diameter of 22 mill. 



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 acu- 

 leate. 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 (PI. II. Fig. II). 



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 con- 

 voluted, the oviduct is longer, the vagina shorter, the genital bladder more cla- 

 vate, with a shorter duct, and there is a small globular vaginal prostate (PI. 

 XI. Fig. C). 



Zonites sculptilis, Bland. 



Shell scarcely perforate, suborbiculur, depressed, subpellucid, pale horn-color 

 above, of lighter shade beneath, shining, with regular, subequidistant, impressed 

 transverse lines, those on the last whorl extending over the periphery, and con- 

 verging in the umbilical excavation ; spire very little elevated, scarcely convex ; 

 whorls 7, planulate, the last rapidly increasing, equal at the aperture to 

 one third the diameter of the shell, beneath flattened, and little excavated in 



