This one has me puzzled:
 http://www.schnr-specimen-shells.com/Hybrid%20cyp.d.JPG and
 http://www.schnr-specimen-shells.com/Hybrid%20cyp.v.JPG .

40mm.  Shallow water, northern Zanzibar.

While it probably isn't a hybrid - i understand these beasties are
pretty scarce -  i am at a loss as to which species to actually call the
critter!

 From warm sunny New Scotland,
ross m.

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