106 HELICEA. 



in his continuation of the Histoire, are both opposed to 

 this theory. Rafinesque, it must be remembered, is respon- 

 sible for the application of the name Icevigata to a striated 

 shell. He makes, however, greater errors than this. 



If Rafinesque notices fuliginosa at all, it is in the Enu- 

 meration, &c. &c. p. 3. 



Omphalina — Differs from Helix by no lips, but an ombalic. 

 O. cuprea. Suboval, four spires, smooth, brittle, diaphanous coppery, 

 shining, opening very large. In Kentucky. 



Griffith writes to Binney that liicubrata is the same as 

 fuliginosa. Adams, 1. c, gives the same opinion, as does 

 also Anthony in his Ohio Catalogue. Notwithstanding 

 the opinion of these authors, I am inclined to believe that 

 neither kicubrata nor Icevigata have any connection with 

 fuliginosa. From letters of Say, in the possession of Mr. 

 Bland, it appears he was unacquainted with fuliginosa. 

 As regards lucubrata it is a Mexican species. If known 

 to us at all, it is by PfeifFer's redescription of it under the 

 name of cadtica. Specimens of this last agree perfectly 

 with Mexican specimens of lucubrata preserved for many 

 years in the Philadelphia Academy. It is, however, at 

 present impossible to decide whether lucubrata has been 

 met with since Say found it in Mexico, (see Binney's ed. 

 p. 36). 



HELIX FRIABILIS. 



Plate LXXX. Figure 2. 



Testa globosa, papyracea, friabilis, subdiaphana, nitens, rufescens ; 

 spira parvula, elevato-conica ; anfr. quatuor, Iseviter corrugati, convexi, 

 ultimus permagnus, ventricosissimus ; sutura mediocris ; apertura circu- 

 laris, parum alta et longa, intus livida, callo levi, albo sub-incrassata ; 

 perist. acutum, tenue, simplex, ad basin reflexiusculum, violaceum, um- 

 bilicum parvum et profundum aliquantum tegens. 



SYNONYMS AND REFERENCES. 



Hdix friabilis W. G. Binney, Proc. Acad. Nat. Sc. Phila. 1857, p. 187; Notes, 

 p. 7. 



