A Few More From Cuba

[wolfi]

Hi Jeff,
a little bit tricky......... . It's often helpful to know the size of the specimens to narrow it down and it's difficult to determine the species with only one view. In your case, I need an interior view of the shell too, to be sure, but I know, it's difficult if you have a living animal attached to a stone.
Nevertheless, I think #5 might be Eoacmaea pustulata (Helbling, 1779) - Acmaeidae. Perhaps you can compare your pictures with pics from the internet. I have many specimens of this species here at home from the Atlantic coast of Mexico, and your specimens look very similar.
#3 and #4 are even more complicated (at least for me.....). It might (!) be Fissurella barbadensis (Gmelin, 1791) - Fissurellidae. The interior of the empty shell should be green. But that's only a guess........ .
Sorry, that's all I can tell on the basis of your pictures. The cracks here will tell you more and better...... .
Kind regards: wolf