The image is a detailed black and white illustration of the foot of a water beetle, specifically *Dytiscus marginalis*. The foot is elongated and appears to be a close-up view, showcasing its intricate structure. The upper portion of the foot is broad and covered in numerous small, circular structures, likely representing bristles or sensory organs. These are densely packed, giving the surface a textured appearance. The foot tapers downwards, revealing a curved, claw-like structure at the end. The illustration is highly detailed, with shading and lines used to create depth and highlight the various components of the foot. The image is labeled with the title 'FOOT OF WATER BEETLE, DYTISCUS MARGINALIS' and a magnification factor of 'x 25'. A note at the bottom right indicates that the image corresponds to page 83. The background is a plain, off-white color, which helps to emphasize the details of the foot.