Crinoid
Crinoids are Echinoderms, related to Star Fish. The organism consists of
a stem, attached to the ocean floor, topped with a swollen cup and a number
of feathery arms. The stems disintigrate into numerous disk like plates,
or cheerios, displaying "5 sided" symmetry in the center cavity.
Images of disks.
Period: Orodovician
Location: Ottawa Valley
