2 PHYSA. 
19. PHYSA DISTINGUENDA, Tryon. 
Plate 6, fig. 16. 
Shell variable in outline, sometimes cylin- 
‘ical, sometimes more inflated, lengthened ; 
ire somewhat longer than in the last spe- 
as; whorls convex, suture well impressed ; 
rface malleated, crowded with growth-lines ; 
verture long and narrow, rather wider below, 
lumella long and narrow, white, almost with- 
it fold, turned a little to the right below. 
Length 13, diam. 7 mill. 
Marysville and Stockton, California. 
The differences between this and the pre- 
ding species have already been pointed out. 
(58) 
