Here are two (or one???) more:
Entemnotrochus adansonianus Crosse & Fischer, 1861
Entemnotrochus adansonianus bermudensis T. Okutani & Y. Goto, 1983
These are from Poppe's Cyberconchology. Even if not all species are
illustrated, the listings are very extensive and can be very helpful:
http://www.club.innet.be/~year0078/EN/Cyberconchology.html
Monika in New England