A large and bizarre trilobite belonging to the group of early Asaphids.  Quality specimens don't come up to often as these are much rarer than Damesella. 

Prepared by Stormbed Paleontological, from an old collection

Monkaspis daulis 

Order Asaphida, Family Monkaspididae

Drepanuridae Paronai zone Kushanian Age,

Kushan formation Middle Cambrian

near Laiwu City, Shandong Province, People's Republic of China