The Edwardsville Formation is famous world wide for its numerous and varied crinoid fossils. This plate does not disappoint, there are four well preserved species of crinoids on this plate -- so typical of the Edwardsville formation that we almost forget how remarkable this is. But this plate is really about one of the few trilobite species found in the Edwardsville formation -- Hesslerides bufo.
The crinoids on this plate are:
Leftmost: Platycrinites hemisphericus
Upper right: Scytalocrinus robustus
Lower left crinoid: Scytalocrinus decadactylus
Lower right crinoid: Cyathocrinites multibrachiatus
There is one near perfect prone Hesslerides bufo trilobite, right next to a Cladochonus beecheri coral.
There is another larger specimen that has its head tucked down. There is some disarticulation of the free checks, but on the whole this isn't too bad as the "second best" specimen.
There is an enrolled and crunched specimen that is largely complete but a train wreck.
There are two partial specimens, each having a head, so in total 5 trilobites are represented, but only two are of high quality.