FAMILY HELICID^E HELIX. 



27 



Helix appressa. 



PLATE II. FIG. II. a. B.— (STATE COLLECTION.) 



Helix appressa. Say, Nich. Encyclopedia ; Jour. Acad. Nat. Sciences, Vol. 2, p. 151. 



H. lingmfera. Fercssac, Tab. systematique, p. 33. 



H. Imgwfhre. Lamarck, Am. sans vert. Ed. Brux. Vol. 3, p. 293. 



H. appressa. Binney, Boat. Jour. Nat. Sciences, Vol. 3, p. 356, pi. 8. 



Description. Shell orbicular, depressed ; base flattened or slightly convex. Whorls five, 

 depressed, forming an angle on the external one, more acute near the superior angle of the 

 lip, with numerous transverse elevated equidistant lines with interstitial grooves. Umbilicus 

 covered with calcareous matter, but concave within. Aperture rather restricted. Lip dilated, 

 reflected, adpressed near the base to the body-whorl, and covering the umbilicus. A slight 

 tooth-like angle on the lower part of the outer lip. Pillar-lip with a strong, prominent, com- 

 pressed, oblique white tooth, gradually becoming obsolete towards the umbilicus. 



Color. Epidermis uniform brownish horn-color ; the lip white, edged with dusky brown. 

 Animal with the neck and the sides blackish. 



Diameter, 0'5-(V8. 



This species appears to exist from the western part of this State southwardly. It has been 

 noticed in Alabama. The lip has occasionally two projecting angles. Somewhat allied to 

 tridentata, but the umbilicus is covered. According to Mr. Binney, this species and palliata, 

 although very unlike, yet their varieties approach each other by nice and scarcely appreciable 

 differences, until they at length seem to blend into one. I am not aware that it has been 

 found north or east of this State. 



Helix exoleta. 



PLATE II. FIG.d. A. B. — (STATE COLLECTION.) 



H. aliolabris, var. unidentata. Ferussac, Moll. pi. 46, A. fig. 6. 



H. zaleta. Say, MSS. as cited by Binney, Bost. Journ. Nat. Hist. Vol. 1, p. 492, pi. 20. 



H. exoleta. BlNHEY, in Uteris. 



Description. Shell convex, somewhat ventricose. Whorls five or six, with minute oblique 

 stria. Suture distinct. Lip white, broadly reflected. Umbilicus covered. Pillar-lip with a 

 prominent oblique tooth. 



Color. Epidermis of a uniform yellowish horn-color. Tooth white. Animal greyish brown 

 or blackish above, and three inches in length. 



Diameter of the shell, 1*0. Height, 6. 



I am indebted to Mr. I. Cozzens for specimens of this species from the banks of the 

 Hudson river, Rockland county. It ranges through the Western States. 



