Public domain photos

The image shows a close-up of three pachychilus lacustris morelet shells from 1849, with a dark background and text at the top and bottom of the image. The shells are arranged in a triangular formation, with the largest shell in the center and two smaller shells on either side.

The image shows a close-up of three pachychilus lacustris morelet shells from 1849, with a dark background and text at the top and bottom of the image. The shells are arranged in a triangular formation, with the largest shell in the center and two smaller shells on either side.Open in library