I have some Eocene pleurotomariids (Entemnotrochus spp.) with bryozoans, but these may be post-mortem. Internal molds are much more common than external, so it is often difficult to tell if anything might have grown on the outside.
Dr. David Campbell
Old Seashells
University of Alabama
Biodiversity & Systematics
Dept. Biological Sciences
Box 870345
Tuscaloosa, AL 35487-0345 USA
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That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa