142 PHYSA. 



19. PHYSA DLSTINGUENDA, Tnjon. 



Plate 6, fig. 16. 



Shell variable in. outline, sometimes cylin- 

 drical, sometimes more inflated, lengthened ; 

 spire somewhat longer than in the last spe- 

 cies ; whorls convex, suture well impressed ; 

 surface -malleated, crowded with growth-lines ; 

 aperture long and narrow, rather wider below, 

 columella long and narrow, white, almost with- 

 out fold, turned a little to the right below. 



Length 13, diam. 7 mill. 



Marysville and Stockton, California. 



The differences between this and the pre- 

 ceding species have already been pointed out. 



(58) 



