A history of the fishes of the British Islands, 1862-65, Great Britain, fishes, The depiction features two elongated eels, showcasing their distinctive serpentine bodies. The top eel has a slightly broader head with a pronounced snout, while the lower eel exhibits a more slender form with a tapered tail. Both eels are adorned with delicate fin structures along their backs, enhancing their streamlined appearance. The illustration highlights intricate details, such as subtle textures and patterns on their skin, emphasizing their aquatic nature and adaptability to their environment.