British sea-weeds. Drawn from Professor Harvey's 'Phycologia britannica.' London, Bell and Daldy, 1863, Great Britain, marine algae, An illustrated plate featuring four distinct species of marine algae. In the top left quadrant, *Ceramium rubrum* is displayed with its slender, branching structure showcasing delicate, frond-like expansions. Adjacent to it, *Ceramium botryocarpum* exhibits a more bushy appearance, with rounded clusters along its branches. The bottom left quadrant illustrates *Gracilaria exigua*, characterized by its finely divided and elongated fronds. Finally, the bottom right presents *Zygnema fluitans*, featuring tapering branches that give it a graceful and flowing look. Each specimen highlights the intricate and diverse forms of algae, emphasizing their beauty and complexity within marine ecosystems.