The fish, the fishes of the world, including at least one extinct fish (#21, Ceratodus, the coelacanth-looking one down there on the bottom left). There are remoras, cow fish, sturgeon … there are sharks, rays, skates … there are lungfish, anglerfish, sea horses, porcupine fish … so many fish, so many shapes.
Know your fish!
This was an illustration from Nouveau Larousse Illustré, an illustrated encyclopedia from 1898. I found it in a collection of Aldolphe Millot illustrations on Wikimedia Commons.