HELIX. 99 



and that Helix tridentata, Say, common in every part of 

 the country, is smaller in Florida than elsewhere. The 

 color of the respective animals is widely different. 



2. HELIX ALBOLABRIS, SAY. 

 PLATE II. 



H. testa orbiculato-convexa, imperforata, luteo-cornea, vel 

 sub-castanea ; anfractibus transverse striatis, striis crebris, 

 obliquis ; labro albo, expanse, margirie late reflexo. 



SYNONYMS AND REFERENCES. 



Helix allolabris, SAY, Nich. Encyc. 181. pi. 1, f. 1. 



Exped. St. Peter's Riv. II. 258. 



American Conch. No. 2, pi. 13. 



FERUSSAC, Tab. Syst. 3G, No. 75. Hist. pi. 43, f. 1, 2, 3. 

 BINNEY, Bost. Jour. Nat. Hist. I. 475, pi. 13. 

 KIETLAND, Report, 172. 

 DE KAY, New York Report, &c., 31. 

 SAGER, Michigan Catalogue, &c., 14. 

 GOULD, Invertebrata, &c., 170, pi. 101. 

 ADAMS, Mollusca, &c., 8. Am. Jour. XI. 272. 

 PFEIFFER, Monog. Helic. Viv. I. 290. 



DESCRIPTION. 



ANIMAL. Varying from pure white and cream color, 

 through various shades of gray to blackish ; upper part 

 of head and neck slightly brownish ; extremities of ten- 

 tacles smoky ; eyes black. Superior tentacles more 

 than half an inch in length when fully extended, slender, 

 and cylindrical. Foot with a slightly expanded margin 

 terminating posteriorly in an acute angle. Glandular 



