For today's critters it seems only fitting that they are crinoids. They have been mentioned a couple of times on this blog, but today brought a surprise with two (and now three) blogs on crinoids. The following is Protaxocrinus from the Ordovician. Protaxocrinus girvanensis can be found in Ayrshire.
The next is Diabolocrinus, also Ordovician in age and found in Ayrshire.