caption: The image shows a close up of a sea urchin on a black background with the text "USNM 27301" at the top left corner. The urchins are a light brown color with spines and ridges, and have a glossy sheen. They are arranged in a symmetrical pattern, with the largest one in the center and two smaller ones on either side. The text is written in a bold, white font and stands out against the dark background.