Ron,
Your dextral "Busycon contrarium" (Now Busycon sinistrum) is probably
Busycon candleabrum. (See Abbott, 1974). This species is from that area and
could easily be mistaken for a dextral Busycon "contrarium".
Doug Shelton
Alabama Malacological Research Center
2370-G Hillcrest Road #236
Mobile, AL 36695