A short edition today. Chris Taylor posted about crinoids, which reminded me of two prehistoric Pokemon from the Emerald series: Lileep and Cradily. They both vaguely resemble crinoids, although I'm not sure exactly what they're supposed to be based on.
Lileep, which is most easily found in Diamond/Pearl in the Underground.
Cradily shares its Rock/Water type with most other Fossil Pokemon, including Kabuto, Kabutops, Omonyte, Omanyte and Omastar.