This is a vintage scientific illustration of a jellyfish, specifically *Periphyla mirabilis*, as indicated by the text at the bottom. The illustration is on a cream-colored background, reminiscent of aged paper. The central focus is a large, bell-shaped jellyfish depicted in a side view. The bell is a pale, translucent yellow, with a subtle gradient towards the edges. Numerous thin, trailing tentacles extend downwards from the bell, creating a complex, flowing pattern. These tentacles are a mix of pale yellow and reddish-brown, adding to the visual complexity. Around the central jellyfish are five smaller, circular diagrams labeled 2 through 6. These appear to be detailed views of the jellyfish's internal structure or different stages of its life cycle. They are rendered in a similar style to the main illustration, with intricate details and a mix of yellow, brown, and reddish hues. At the top of the image, the text reads “The Voyage of H.M.S. Challenger” and “Deep-Sea Medusae Pl. 18”. At the bottom, the name of the jellyfish, “PERIPHYLLA MIRABILIS”, is prominently displayed. The names of the illustrators, “J. Hancock and A. Gilruth, Del.” and “R. Ellis, Litho.” are also present. The overall style is detailed and precise, characteristic of scientific illustrations from the 19th or early 20th century.