The book "Investigation of the visual organs of trilobites" by Gustaf Lindström is one of the classic scientific studies devoted to the examination and analysis of the visual organs of ancient marine fossils - trilobites. In his work, the author examines in detail the structure of the eyes of these extinct invertebrates, revealing their complex structure and specific functioning. Lindström offers his own hypotheses regarding the adaptations of the visual organs of trilobites to the conditions of the environment in which they existed, and also provides an explanation of their role in their daily life. The book contains numerous illustrations and diagrams that help the reader better understand the subject of the study. This is a must-read for anyone interested in paleontology, evolution, and biology in general.