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Cretaceous echinoids
...old currencies replaced by sand dollars?
'Echinodermata' is a unique phylum in  having crystalline calcite crystals composing the skeletal elements...some paleontologists  feel that echinoids and their relatives are so unique in structure and function that the animal kingdom  should be divided into two major groups...echinodermata and the rest of the animal kingdom!
5 cm
Phymosoma texana
3.5cm (5 cm)
6 cm
Heteraster occidentalis
Hemiaster whitei
Phymosoma magnificum
4 cm
3 cm
Phymosoma microtuberculata
Heteraster oblongus
6 cm
3 cm
Micraster coranquinum
Salenia texana
and echinoid spines
2 cm
2.5 cm
2.5 cm
Salenia mexicana
Loriolia texana
Goniopygus texana
4 cm
7 cm
'Micraster' sp.
2 cm
Echinocorys scutata
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Cretaceous Room
Gautheria radiata
1