ZONITES. 453 



Jaw arcuate, largo, simple, concave margin with a strong median 

 projection. 



Lingual membrane broad, teeth long and slender, central tricus- 

 pid, lateral bicuspid, uncini aculeate, curved. The central and lat- 

 eral teeth are arranged in straight, transverse rows, the uncini in 

 somewhat diagonal rows, thus dividing the lingual membrane into 

 three distinct transverse sections. 



The species of this genus are allied to the Hijalince by the char- 

 acter of the shell, jaw, and lingual dentition, but differ from tliein 

 hi the presence of the caudal mucus-pore. 



Zonites inornata. 



Shell depressed, smooth, sliinuig; whorls five; aperture transverse, obliquely 

 lunar; peristome thui, acute ; umbilicus small. 



Helix inornata, Say, Journ. Aoiul. ii. 371 (1821); Binney's cd. 24. — Binney, Bost, 

 Journ. Nat. Hist. iii. 419, pi. 21, fig. 3 (1840) ; Terr. Moll. ii. 227, pi. 34. — De Kay, 

 N. Y. Moll. 39 (1843). — Adams, Vermont Moll. 161 (1842). — Pfeiffer, Men. 

 Hel. Viv. i. 84 ; iv. 48. — W. G. Binney, Terr. Moil. iv. 109. — Morse, Am. Nat. 

 i. 314, figs. 19, 21, 22 (18G7). 



Helix (jhijihi/ra, Pfeiffer, olim, Symb. ii. 29, excl. syn. fuliginosa ; Mon. Hel. Viv. i. 

 .')7, not Say. — Reeve, Con. Icon. 067. 



Helix inornata, Bixxev, not Say ; Bland. Ann. N. Y. Lye. vii. 127. 



Hyalina inornula, Trvon, Am. Journ. Condi, ii. 249, pi. 4, fig. 22 (1866). 



Shell depressed ; epidermis yellowish horn color, smooth, shin- 

 ing, with very minute lines not breaking the smoothness 

 of the surface ; whorls five ; suture not much impressed ; 

 aperture transverse, scarcely oblique, obliiiuely lunar, 

 with a thick, white, testaceous deposit around its whole 

 inner surface, a little distant from the margin ; peris- 

 tome thin, acute, fragile, its ends somewhat converging, 

 the columellar margin reaching to the centre of the base, 

 sub-dilated above ; umbilicus small ; base rather flat- ^ inomata 

 tened, indented in the centre. Greater diameter, six- 

 teen mill. ; lesser, twelve and a half mill. ; height, six millimetres. 



From North Carolina to Kentucky through the States bordering 

 on the great lakes. In the western parts of New England it is 

 found, but very rarely. Berkshire County, Massachusetts (^Buiney^. 



Animal with head, neck, and eye-peduncles bluish-black ; foot 

 whitish. Eye-peduncles long and slender. A marginal furrow ex- 

 tending along the edges of the foot, and uniting above and before 



