This is a bargain, 3" long (if outstretched) specimen of Morocconites malladoides. The genus has a distinctive pointed rostrum coming off the front of it's head. Eye facets are visible in both eyes. The preparation is a bit rough in and there is a lot of shell damage to the head, hence the bargain price.
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.