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This scientific illustration provides a comprehensive study of a prominent Eocene protozoan, showcasing the intricate calcareous test characteristic of the nummulitid family. The diagram features three distinct views that document the complex three-dimensional geometry of the organism: two external perspectives with partial cutaways reveal the smooth, coin-shaped profile and the undulating suture lines of the outer surface, while the third figure provides a horizontal cross-section. This sectional view highlights the characteristic planispiral coiling, where a series of numerous, small chambers are arranged in a tight, multi-whorled spiral radiating from a central point. These detailed renderings emphasize the rhythmic growth and robust mineralization of the shell, which allowed these large single-celled organisms to contribute significantly to the formation of limestone deposits across Europe and North Africa. By capturing both the macroscopic "coin-like" form and the precise internal partitions, the plate serves as a technical record of the microfossils that define the marine environments of the Middle Eocene.