Edmund Lyddane Jones, 86, a retired senior partner in the noted Washington law firm of Hogan & Hartson who specialized in trial work and corporation law, died at his home in Washington Thursday following a heart attack.

Mr. Jones was born in Rockville and graduated from old Western High School in Washington. He was a track star at Georgetown University, where he earned his law degree in 1916 and was admitted to the D.C. Bar. While still a student at Georgetown, he went to work as an office boy and law clerk for Frank J. Hogan, a founder of the firm that bears his name.

Following service in France as a lieutenant in the field artillery during World War I, Mr. Jones resumed his association with Hogan.In 1928, he became a partner and was Hogan & Hartson's senior partner when he retired in 1974. In 1959, he was named Lawyer of the Year by the D.C. Bar Association.

Mr. Jones was active on numerous committees of the bar. He was a member of the committee on admissions and grievances for more than 40 years. Because of his expertise in trial work, he served on the D.C. Bar Association committee that prepared the original standardized jury instructions. These instructions are used by judges to explain the elements of different crimes to juries -- the judges explain the law to juries, the juries decide the facts.

In addition, Mr. Jones was chairman of the committee on trial problems under a conference convened by President Dwight D. Eisenhower to study administrative procedure. He served on the committee on admissions and grievances of the U.S. Court of Appeals for the District of Columbia Circuit.

Mr. Jones was a fellow of the American College of Trial Lawyers and a member of the American Judicature Society, the Lawyers Club, of which he was a former president, and the Barristers. He also was active in the old Community Chest drives and was a member of the Washington Board of Trade.

He was a former member of the board of the Metropolitan Club and a member of the Burning Tree and Chevy Chase clubs.

Mr. Jones's first wife, Bettina Prescott Jones, died in 1957.

Survivors include his wife, Bessie G. Jones of Washington; three children by his first marriage, Mrs. John A. Curtis of Williamsburg, Va., Mrs. Edward G. Picken of Chevy Chase, and Edmund L. Jones Jr. of Silver Spring; a stepdaughter, Irene L. Groves of Leicester, England; one sister, Marie Diamond of Rockville, and seven grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Children's Hospital National Medical Center, Washington, D.C.