CONCHOLOGY. 



PLATE XLIX. 



HELIX PERVERSA 

 PERVERSE HELIX. 



Univalve. 



Shell spiral, somewhat diaphanous, brittle: aperture con- 

 tracted, semilunar or roundish. 



SPECIFIC CHARACTER 

 AND 

 SYNONYMS. 



Whorls turning right or left, ovate oblong, smooth, yellow, 

 with or without rufous spots, or streaks, hp white, reflected. 



Helix Perversa : testa dextra vel sinistrorsa, ovato-oblonga, 

 laevi, flava, vel immaculata vel maculis, vel 

 strigis rufis ; labro albo reflexo. 



VOL.II, 



