My shell looks like a Conus Pulcher but smaller. Identification help?

[snickeroni]

I'm working (conservation) on an African necklace which has four shells at the end. A quick flip through Harasewych and Moretzsohn's Book of shells and the Butterfly Cone/ Conus Pulcher pattern is identical to that on my shells. But these range between 50 and 226 mm. Mine are smaller - the smallest one is 21 mm and the longest is 30 mm.

What I'm also noticing when trying to find a match in shell catalogues is that mine have a very flat top, while a lot of similar looking cones have pointed tops.

Photo:
http://imgur.com/a/fyfZ9
http://imgur.com/a/7dUP3

Does anyone know what I'm looking at here?

Thank you.
Di