>Cyprogenia aberti
According to Jeanne Serb's molecular work (PhD and submitted paper), this species as currently used probably includes more than one species. There are anatomical distinctives, but the shells are very similar.
Dr. David Campbell
Old Seashells
University of Alabama
Biodiversity & Systematics
Dept. Biological Sciences
Box 870345
Tuscaloosa, AL 35487-0345 USA
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That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa