BORN. To Siem Nijssen, 27, Dutch steelworker, and Corry Nijssen, 27, his wife who had been taking hormone treatments prior to conception: sextuplets, four girls and two boys; in Leiden, The Netherlands. Born two months prematurely, the sextuplets were delivered by caesarean section and then placed in an incubator. If they survive they will become the second living set of sextuplets in the world.

MARRIED. Richard Pryor, 36, zany, biting, black comedian who has his own NBC weekly show and is about to star in the film version of the Broadway hit The Wiz; and Model Deboragh McGuire, 23; he for the fourth time, she for the first; at his home in Northridge, Calif.

DIED. Kurt Adler, 70, chorus master and conductor at New York's Metropolitan Opera (1945-73); after a long illness; in Butler, N.J. A calm man in a frenetic job, Adler said of his chorus, "They are like any other group of people, as good as you make them be and as bad as you let them be."

DIED. Marion K. Sanders, 72, journalist, novelist (The Bride Laughed Once) and biographer of Journalist Dorothy Thompson; of a heart attack; in Manhattan. While working for the State Department, Sanders helped develop its publications program and served as editor in chief of the Russian language magazine Amerika. She later worked as an editor at Harper's and Atlas World Press Review.

DIED. William Herbert Sheldon, 78, psychologist who developed a theory of "somatotypes" correlating varieties of human physique with behavior; of a heart ailment; in Cambridge, Mass. After studying with Carl Gustav Jung in Switzerland, Sheldon returned to the U.S., where he interviewed several thousand subjects for the theory he popularized. People with a frail physique and introverted behavior he called ectomorphs; those muscular in build with a predisposition for physical activity were mesomorphs; and those fleshy in shape and outgoing in personality were endomorphs. Sheldon also did research in the relation between these body types and organic disease.

DIED. Irma Duncan, 80, adopted daughter and disciple of Isadora Duncan, the flamboyant founder of modern dance; in Santa Barbara, Calif. Born in Germany, at seven Irma Ehrich-Grimme joined Duncan's school at Gruenewald as a scholarship student. She and five other "Isadorables" were later legally adopted by the famous dancer. In 1921 Irma helped her mother found a dancing school in the U.S.S.R., and after Isadora's death in 1927 brought to the U.S. a troupe of Soviet girls. She became a U.S. citizen and opened, in Manhattan, the first American Isadora Duncan School of the Dance.

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