The cemetery includes two ossuaries; Phelizot is 10 rows up from the right ossuary, Grave 5952.

A standard French Military grave marker; a white cross with an inscribed centerpiece.

René (Claude) Phelizot was from Chicago, Illinois, and served in the 2^nd Regiment of March of the French Foreign Legion.  He was KIA on March 6, 1915 while fighting on the Champagne battlefields in France during WW1.

From: American fighters in the Foreign legion, 1914-1918 by Paul Ayres Rockwell: 

Phelizot was one of the best-known big-game hunters and elephant-killers in Africa, where he had lived for years. He was one of the most beloved volunteers in the Legion, and one of the most helpful and generous. At Christmas time he sent from the trenches four hundred dollars toward a fund to buy gifts for poor Paris children. On the march he was ever ready to help weaker comrades by carrying their rifles or packs. 

From the Mémoire des homes (French Ministry of Defense) Website:

René PHELIZOT 

Mort pour la France le 06-03-1915

Career: 

Unit: 2 R.M.L.E.

Recruitment office: Seine (75 - Paris (ex Seine))

Reference: Mort pour la France

Sépulture:

Place of burial: Cormicy (Marne)

Name of burial site: nécropole nationale 'La maison bleue'

Type of burial: tombe individuelle

Number of grave:5952