The image is a scientific illustration titled "Adjustment of Flatfishes" by Francis B. Sumner, labeled as Plate 4. It's divided into four sections, labeled 2a, 2b, 2c, and 2d. **2a:** Shows a close-up of a dark, grainy sea floor covered in small, dark particles, likely sand or sediment. The texture is quite dense and uniform. **2b:** Depicts a flatfish, viewed from above, blending into the dark sea floor. The fish is oval-shaped with a slightly pointed end. Its body is covered in small spots, providing camouflage. It appears to be lying flat on the seabed. **2c:** Shows a close-up of a seabed covered in pebbles and shells of varying sizes and shapes. The pebbles are light-colored, creating a contrasting texture to the dark sediment in 2a. **2d:** Features another flatfish, similar in shape to the one in 2b, but with a slightly different pattern of spots. It's also lying flat on a seabed that appears to be a mix of sand and small pebbles. The fish is well-camouflaged against the background. The overall tone of the image is monochromatic, with shades of gray and black. The illustrations seem to be focused on demonstrating how flatfish blend into their environment through camouflage.