Ammonites.Coiled up things. In life they would probably have had something resembling a squid's head sticking out of the open end of the coiled up shell. If you are lucky you will find a whole ammonite loose on the beach, but often you will find it partly encased in a hard rock nodule. You'll also see crescent shaped ammonite fragments.
Belemnites.Bullet shaped or cylindrical fragments (the rostrum) or something that looks banded (the phragmacone).
Bivalves.Things that resemble modern clams or mussels (the one on the left appears to have a hole punched in it).
Coprolites are fossil pooh, here being photobombed by a small Eleganticeras ammonite.
Devils toenails (Gryphaea).