A 1964 Radcliffe graduate and a member of the Harvard Class of 1964 now on leave of absence were arrested Tuesday in Rochester, N.Y., and charged with illegal possession of marijuana.

After Susan M. Ryerson of Cambridge and Peter I. de Lissovoy of Chicago were arraigned in Rochester City Court, Miss Ryerson was released on $10,000 bail. De Lissovoy's bail was set at the same figure.

The Boston record-American reports this morning that postal authorities allegedly found a list in Miss Ryserson's Rochester apartment which apartment which, the paper says, contains names of college students in the Greater Boston area who might have received marijuana through the mail from de Lissovoy and Miss Ryerson.

A letter allegedly containing marijuana sent by Miss Ryerson to a former Cambridge resident, Miss Andres, Clarke, at her home in Ashville, N.C., touched off the investigation. However, postal authorities have brought no charges against either Miss Ryerson or de Lissovoy.

Rochester police called FBI agents into the case after seizing letters and diaries which described the participation of Miss Ryerson and de Lissovoy in civil rights projects in the South.

This morning's Record-American asserts that the diaries told of "sex and dope orgies" in Mississippi last summer.

In a telephone interview last, night, Detective Captain James J. Cavoti of the Rochester police, who supervised the investigation, vigorously denied the newspaper's assertion. A reliable source in Rochester affirmed that the diaries con- tain "nothing indecent or scandalous."

De Lissovoy holds a Houghton Mifflin Literary Fellowship and is currently working on a book about the failure of the civil rights movement in Albany, Ga. He has written widely praised articles on civil rights for the Nation and for the CRIMSON. Miss Ryerson teaches at a private secondary school in Rochester.

The Associated Press yesterday quoted Detective Captain Cavoti as saying: "We don't know whether they were selling the stuff. It apparently was giver a away.