Paul,
If you get the names could you please let us know. I also have one of the
Melongena shells and have always considered it to be a form of Volema
myristica. However, it is much, much lighter in build and I have always
been uncomfortable with that identity. The suggestion of Melongena
bispinosa on Bret Raine's page is interesting but I can not find an image of
this shell anywhere on the net. Anyone have one they can scan? Or confirm
the identity on Bret Raine's site?