Reactions to light in Planaria maculata with special reference to the function and structure of the eyes
A 1918 experimental zoology monograph by William Hay Taliaferro, published in Baltimore, reporting on light responses and eye structure in the flatworm Planaria maculata for fellow biologists. The plates are pen diagrams of the pigment-cup eye in section, with stippled pigment masses, numbered retinal cells, and straight arrows tracing incoming light, plus outline views of the whole worm's head — usable as schematic optics, labelled ray diagrams, and stipple texture.
