This is a Cross Section of Ascaris. The Ascaris [be advised!] is a genus of parasitic worms also known as giant intestinal roundworms. One species Ascaris umbricoides is a common human parasite. It is so common that it has inspired many stories both true and otherwise!

This slide was purchased on Ebay and is part of 100 prepared slides " set A" You'll find that these pictures of Ascaris cs are better than what you'll find elsewhere!