Modocia brevispina
Cambrian
Wheeler Shale,
Drum Mountains, Millard County,
Utah
USA
 
it is a trilobite coming from the Cambrian  of Mwheeler shale deposits of Drum Mountains in Utah. this is a nice example of a trilobite belonging to the genus Modocia. The short genal spine give the name to trilobite Brevi-spina. It is a nice sample of trilobite on sale.
This trilobite is associated with a strange shell form, maybe an earlier cephalopod.