A customer who would accept Cypraea teulerei as C. fultoni would probably also
accept Conus textile as C. gloriamaris.  However, it is doubtful that such a
person would be looking to spend several hundred dollars on a seashell anyway.
There is a famous story about a fellow who did mistake C. textile for C.
gloriamaris.  As the story goes, while exploring a section of reef in a small
boat, he found a number of C. textile crawling about.  He recalled a picture
he had seen, of the "priceless" C. gloriamaris, and thinking he had discovered
a fortune, started picking up the C. textile and putting them in the boat.
They later found him unconscious in the boat, and he subsequently died as a
result of the several stings he had received.  Anyway, if anyone has any
doubts about the identity of Cypraea teulerei, the lack of teeth in the
aperture will separate it from anything else that might resemble it.
Paul M.