Oyster and random beach gleanings.
It was suggested that these were the scutes of a diamondback terrapin.
Water oak acorns, some of the smallest of the genus Quercus.
Something larval hanging out in an acorn cap.
"I celebrate myself, and sing myself,/And what I assume you shall assume,/For every atom belonging to me as good belongs to you.//I loafe and invite my soul,/I lean and loafe at my ease observing a spear of summer grass."