Born. To Thomas Hitchcock Jr., 39, world's No. 1 polo player; and Margaret Mellon Laughlin Hitchcock, 38, grandniece of the late Secretary of the Treasury Andrew William Mellon; twin sons, their third and fourth children. Weights: 7 Ib. 8 oz. and 7 Ib. 10 oz. Names: Thomas and William.

Married. John Barbirolli, 39, conductor of the New York Philharmonic-Symphony; and Evelyn Rothwell, 28, top-flight British oboe player; in London. Conductor Barbirolli was divorced last month by Marjorie Parry, British opera singer, for desertion.

Married. Jefferson Davis Dickson, 43, Natchez, Miss, farm boy who became Europe's No. 1 sports promoter, built, owns and operates the Palais des Sports in Paris; and Louise Wedell Mastbaum, 29, Philadelphia heiress; in Greenwich, Conn. For years Dickson was a devoted swain of Skater Sonja Henie.

Married. Sacha Guitry, 54, flamboyant French actor-playwright-producer; and Genevieve de Sereville, 18, beauteous, stagestruck debutante; he for the fourth time (other brides: Charlotte Lyses, Yvonne Printemps, Jacqueline Delubac); in Versailles. Hour before the wedding Actor Guitry personally invited President & Mme Lebrun. They hedged, finally sent a minor official in their stead.

Divorced. Raymond Massey, 42, cadaverous, Canadian-born actor (Abe Lincoln in Illinois); by his second wife, Actress Adrienne Allen Massey, 32; in Reno. Grounds: cruelty.

Divorce Disclosed. Peter Arno (real name: Curtis Arnoux Peters), 38, clean-cut, cafe-socialite cartoonist (The New Yorker); by Mary ("Timmie") Lansing, 24, beauteous socialite; her first, his second; in Litchfield, Conn. Grounds: "intolerable cruelty."

Died. Clarence Mott Woolley Jr., 22, captain and outstanding player of Yale's 1939 polo team; of a brain concussion after a hard spill during a Brook League match; in Manhattan.

Died. Alfonso Laurent Cik, 38, Yugoslav decorator, whom Spanish Nationalists accused of decorating Loyalist prison cells with weird designs that changed under dazzling lights, drove prisoners mad; at the hands of an official garroter; in Barcelona.

Died. Henry Havelock Ellis, 80, bronzed, white-bearded essayist, editor (The Mermaid Series of Old Dramatists), sexologist, whose lifework (housebreaking sex) is contained in his monumental four-volume Studies in the Psychology of Sex; in Hintlesham, England.

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