Description of three new Tasmanian Helices

Collected on a trip from Chudleigh to Mount Bischoff, made by R. M. Johnston, Esq., T. R. Atkinson, Esq., and the describer.<br>Helix antialba- Shell umbilicated, concave on both sides, thin, covered with thread-like riblets. Helix Bischoffensis.-C. E. Beddome.<br>Shell imperforate, flatly globose, whitish brown, very finely striated, the striae crossed with very fine hues, giving the shell a granulated appearance and Helix, Gadensis.-C. E. Beddome.<br>Shell with a large perspective umbilicus, equalling one quater of its diameter,