In previous blogs (More. . ., and Artist-Scientist Maria Sibylla Merian. . .) I referred to the artist/naturalist. Here's a link to 100 images by Ernst Haeckel, whose work survives alongside the prints of Maria Sibylla Merian. Here's a link to an exhibit of natural history books by ten authors, including Merian. Here's a link to the work of Richard Hertwig, a scholar of Ernst Haeckel.
Here's just one image of radiolarians from Haeckel's Kunstformen der Natur (Artforms of nature), followed by my own interpretation, "Radiolarian Skeleton."