Hi Glenn,
I'm not familiar with that name. Do you mean Tonna canaliculata? If so, that
name is a synonym for Tonna cepa (Roding). That shell grows to about 4 - 4
1/2 inches (100 to 115 mm), so yours would be a rather small one at 60 mm, if
that's what it is.
Regards,
Paul Monfils