HELIX. 261 



79. HELIX LINEATA. 



Plate LXVIII. 



H. testa parva, discoidea, supra planulata, subtus concava, 

 corneo-virescente ; anfractibus quatuor, lineis parallelis, vol- 

 ventibus, sub-elevatis ornatis ; umbilico lato, expanse ; labro 

 simplici ; fauce dentibus binis armato. 



SYNONYMS AND EEFERENCES. 



Helix Uneata, Say, Journ. Acad. I. IS, II. 273. 



KiRTLAND, Ohio Report, 173. 



BiNNEY, Bosl. Journ. Nat. Hist. III. 436, pi. 22, f. 6. 



De Kay, New York Report, 31 ; Fauna, 44. 



Gould, Invertebrala, 179, f. 103. 



Adams, Vermont Mollusea, 11. 



Fep.ussac, Tab. Syst. 44 ; Hist. pi. 79, f. 1. 



Chemnitz, 2d ed. tab. 101, f. 13-15. 



Pfeiffek, Monog. Helic. Viv. 1. 184. 

 Euryompltala Uneata, Beck, Index, 8. 



DESCRIPTION. 



Animal whitish, transparent, threadlike. 



Shell small, discoidal ; epidermis greenish ; whorls 

 about four, visible on the base of the shell as well as 

 above, with numerous equidistant, parallel, raised lines 

 revolving upon them ; suture much impressed ; aperture 

 semi-lunate, narrow, not expanding ; lip thin ; umbilicus 

 wide, forming a concave depression of the base, each 

 volution visible to the apex ; within the aperture, on the 

 external circumference, are placed two pairs of minute, 

 conical, white teeth, the first pair in sight when looking 

 into the aperture, the other more remote. 

 VOL. n. 66 



