Nummulites 		

Egypt

Eocene 

A nummulite is a large lenticular fossil, characterized by its numerous coils, subdivided by septa into chambers. 
They are the shells of the fossil and present-day marine protozoan Nummulites, a type of foraminiferan. 
Nummulites commonly reach 6 cm (2.4 inches) in diameter, and are common in Tertiary marine rocks, 
particularly around the Mediterranean (e.g. Eocene limestones from Egypt). 
Image above shows the outside and inside of the shell.
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