ZONITES. 105 



era Pennsylvania, Xorth Carolina (at least as far as Goldsboro'), Georgia, Ala- 

 bama to the Gulf of Mexico, and Arkansas. 



Animal light slate or smoky white, dark blue on head, eye-peduncles, and 

 tentacles; tuberosities on back few and large; a line of furrows runs along the 

 side of the foot, and rising on the tail meets that of the opposite side above a 

 well-marked mucus pore. The sides, labia-like, of the pore are prominent and 

 swollen. The pore opens and shuts, and freely exudes mucus. 



Jaw as usual in the genus. 



Z. demissus (PI. II. Fig. O) has 45 1 45 teeth, with 15 laterals. My spe- 

 cimen was one of the large East Tennessee form, called Z. acerrus by Dr. 

 Lewis (Proc. Ac. N. Sc. Phila. 1872, 110). The typical 

 form from near Mobile has, however, a perfectly similar den- 

 tition. 



The genitalia are like those of Z. intertextus, Binney, fig- 

 ured by Dr. Leidy in Vol. I. The accessory glands of the 

 dart sac are rather shorter in demissus. z . acerrus 



The large form referred to as Z. acerrus above, is here 

 figured. Its greater diameter is 20 mill.; height, 8 mill. It has over 7 

 whorls. From Eastern Tennessee. 







Zonites ligerus, SAY. 

 Vol. III. PI. XXXV. 



Shell perforated, orbicularly convex ; epidermis yellowish horn-color, shin- 

 ing ; whorls 7, finely and thickly striated transversely, smooth below ; suture 

 not much impressed ; aperture semilunate, rounded ; peristome thin, acute ; 

 base and side of the outer whorl, within the aperture, thickened and white ; 

 perforation very small; umbilical region impressed. Greater diameter 15, 

 lesser 13 mill.; height, 10 mill. 



Helix ligera, SAY, Journ. Acad., II. 157(1821); BINNEY'S ed., 19. BINM.V, 

 Bost. Journ. Nat. Hist., III. 412, PI. XX. Fig. 1 (1840) ; Terr. Moll., II. 204, 

 PI. XXXV. (1851). LEIDY, T. M. U. S., I. 257, PI. XII. Figs. 4-7 (1851), 

 anat, DEKAY, N. Y. Moll. 40, excl. fig. ? (1843). CHEMNITZ, 2d ed., I. 

 108, PI. XXXIII. Figs. 5-7. DESHAYE* in FER., I. 184. PFEIFFEI:, Mon. 

 Hel. Viv., I. 48. REEVE, Con. Icon., 493 (1852). W. G. BINXEY, Tor. 

 Moll., IV. 95. LEWIS, Am. Journ. Conch., VI. 190, PI. XII. Figs. 3, 4. 



Helix Rafinesquca, FERUSSAC, Tab. Syst., 50 ; Hist., PI. LI. a, Fig. 5 ; PI. L. a, 

 Figs. 4, 5? PFEIFFER, Symb., I. 39. 



Helix Wardiana, LEA, Trans. Am. Phil., VI. 67, PI. XXIII. Fig. 82 ; Obs., II. 67 

 (1839). TROSCHEL, Arch, fur Nat. 1839, II. 221. DEKAY, X. Y. Moll., 46. 



Mcsomphij- ligera, TRYON, Am. Journ. Conch., II. 255 (1866). 



Hijalma ligera, W. G. BINNEY, L. & Fr.-W. Sli., I. 44 (1869). 



A species of the Interior Region, having been found from Arkansas and 

 Georgia to the Great Lakes; north of Maryland it does not appear east of the 



