Kevin, I'm fairly certain your tooth is a lower Hemipristis symphyseal.  I have collected several of these teeth over the years, and you see some real interesting attributes when the teeth get small, narrow, and "squooshed".  The reason why I think it is a hemipristis is because of two things; the "take-off" of the crown from the labial side of the root base is just like that of a hemi, and the appearance of a nutrient groove which I think is actually the two root lobes squeezed together because they are so close.  In the left image I also see what appears to be a slight cutting edge that doesn't come all the way down the blade to the root, another characteristic of lower hemi's.

There's another category of teeth that this tooth resembles and that is of what I call "nubby" teeth.  These are the small chubby rooted, short stubby crowned symphyseal tiger shark teeth (G. contortus).  I have many of these as well, but your tooth matches the chracteristics of a hemi much better than the tiger symph.

Cool find!

Daryl.