Hi Ralph,
I'm no expert, but in referring to my little "Essential Dictionary of Music" by Alfred publishing, the Notation rendering of the Turn is "correct" (according to the Dictionary, anyway) while your notation is referred to as an "Inverted Mordent".
I know that even though we think of "standardized notation", sometimes there are still differences in definition of terms due to historical or genre differences. I think this is probably one of those instances
Thanks for pointing out the difference in this instance, and for the opportunity for me to learn a bit more in the process.
ttfn,
Sherry