Felix C. Montuori, 85, operator of dental and medical laboratories here for 31 years and inventor of dental devices, including the widely used Carpule syringe, died of pneumonia Tuesday at Fernwood House retirement and nursing center in Bethesda.

A pioneer in devising dental and medical equipment, Mr. Montuori held hundreds of patents in this country and abroad. In 1924, he founded Montuori Laboratories here, which he operated until his retirement in 1955.

Mr. Montuori was born in New York City. He served as a cavalry officer at Fort Myer during World War I and attended dental school while in the Army.

During the 1920s and 1930s, he was active in the old Washington Riding and Hunt Club. As the hunt's master of foxhounds, he organized hunts every Saturday in Rock Creek Park.

His 150-year-old farmhouse in Rockville, purchased in 1940, was built on a 50-acre tract on Rockville Pike. The stately white-frame structure, an eye-catcher for years, was recently torn down to make way for the Nicholson Lane Metro station being built on property Mr. Montuori sold for that purpose.

Survivors include his wife of 61 years, Drusilla Kendall Montuori, of the home in Bethesda; three sons, Carl F., of Chevy Chase; Clyde B., of Bethesda, and Warren K., of Potomac; eight grandchildren and one great-grandchild. Another son, Allen, died in 1947. CAPTION: Picture, FELIX C. MONTUORI