134 HELICID^. 



I then supposed had been imposed by Mr. Say. Not 

 having since been able to procure any information about 

 its origin, and finding it to be destitute of meaning, and 

 probably a corruption of the word intended to be used, 

 I have ventured to substitute for it the specific name of 

 exoleta. This word was undoubtedly suggested to the 

 person fii-st proposing it by the idea that the shell was 

 the adult, or superannuated form of H. alholabris. 



18, HELIX DENTIFERA, BiNNET. 

 Plate XII. 



H. testa orbiculato-depressa, imperforata, luteo-cornea ; 

 spira subplanulata, subtus convexa ; anfractibus transverse 

 striatis, striis crebris, minutis ; peristomate albo, margine 

 late reflexo ; columella valde unidentata. 



SYNONYMS AM) EEFEEENCES. 



Hdix dentifera, Binney, Boston Journ. Nat. Hist. I. 494, pi. 21. 

 De Kat, New York Keport, 31. 

 Adams, Mollusca, &c., 9. 

 Pfeutek, Monog. Helic. Viv. I. 317. 



DESCRIPTION. 



Animal grayish on the sides and posterior extremity, 

 brownish on the upper parts, darker on the head and neck, 

 foot long and narrow, superior tentacles long and slen- 

 der, eyes black. 



Shell flattened-convex on the upper surface, convex 

 below ; epidermis yellowish horn-color, immaculate ; 



