This is an acorn it is dark brown on the bottom and light brown on the top. It was in the grass at umass next to a tree and amongst other acorns. The acorn is extremely hard except the top of the acorn is still hard but softer than the bottom.
Hemichordata is a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta (acorn worms), and Pterobranchia. A third class, Planctosphaeroidea, is known only from the larva of a single species, Planctosphaera pelagica. The extinct class Graptolithina is closely related to the pterobranchs.