This set of 5 photos are of teeth that we call I. hastalis - upper jaw.  Bob Purdy at the Smithsonian & elasmo.com call them I. xiphodon.  The dark ones are from the Pungo River Formation.  The light ones are from the Yorktown Formation.

The first photo is of all 22 teeth.  The next 4 photos are close ups of the teeth in groups.

The largest is 2.165" (55mm).  The smallest is 1.338" (34mm).

Prices:
Row 1   (#1, #2, #3, #4, #5, #6)                     - $33 each
Row 2   (#7, #8, #9, #10, #11, #12)               - $27 each
Row 3   (#13, #14, #15, #16, #17, #18)        - $21 each
Row 4   (#19, #20, #21, #22)                        - $14 each