A while back there was some discussion about x-ray images of shells and one
of the folks who participated was Steven Crow.  He has a CD with a bunch of
x-ray images for sale at his web site.  Well, this is not an indorsement or
an advertisement for Steve's product, but it is a plug for his site...
http://home.att.net/~crowmd
 
He now has a different x-ray image of a shell posted every day.  I
personally find these fascinating (must explain why I bought those shells
sliced in half in the Philippines).  Today's image is an x-ray of a Cassis
rufa.
 
Tom Eichhorst in New Mexico, USA