34 
S. intermedium differs from S. bilineatum in showing no indication 
that the annulations take the place of the striations in the more mature 
part of the shell. It differs from S. balteum in having a median stria 
stronger than the very fine ones in the longitudinal groove. 
Horizon and Locality. Richmond: Beaverfoot? Loc. B. At 95 feet 
above the base of the Beaverfoot near the headwaters of Windermere 
creek, Stanford range, B.C. 
