D. Jacob Christian Schäffer's Abhandlungen von Insecten, Regensburg, Verlegts Johann Leopold Montag, 1764-1779, insects, parasites, The illustration features various marine specimens, focusing on a horseshoe crab, prominently displayed in the center. Its distinctive, rounded shell is intricately detailed, showcasing the segmentation of its body and appendages. Surrounding the horseshoe crab are additional figures: a long, slender organism depicted to the left, likely representing a type of sea creature, and a wispy, segmented structure on the right, which may be related to marine arthropods. Each specimen is labeled with numerical figures, indicating their significance within the context of the study. The overall composition highlights the diversity of marine life and serves as a scientific reference for biological research.