Crinoid

Source: https://en.wikipedia.org/wiki/Crinoid

Age - Lower Carboniferous (358.9 - 323.2 MYA)|
Origin - Morocco

Crinoids are marine animals that make up the class Crinoidea of the echinoderms. They live in both shallow water and in depths as great as 9,000 meters (30,000 ft.). Those crinoids which in their adult form are attached to the sea bottom by a stalk are commonly called sea lilies. Crinoids are characterised by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults.

Size: 2 3/4" x 4 1/2"