OK - I was hoping that someone else would answer this one, but since
no-one else has responded, I'll try to do it as tastefully as
possible.  Martin, I know of no published common name for Typhis
latipennis.  But the species name means "side penis", in reference to
the long, tubular (dare I say erect?) spine which projects from the
side of the shell.  If you can create an acceptable common name for
your label from that information, go for it!
Regards,
Paul M.