YORKTOWN, N.Y. (AP) _ A skull discovered last week has been identified as the remains of a 12- year-old girl whose 1984 disappearance set off one of the most intense searches in New York City history, authorities said.

The identification of Antonella Mattina was made Monday by Westchester County authorities, said New York City Detective Joseph McConville. The girl was reported missing July 16, 1984.

Yorktown police investigating possible hunting law violations found the skull on Thanksgiving Day about 40 feet off a highway, McConville said. No other body parts were recovered, and authorities believe there are no more in the area, said state police spokesman Sgt. Dennis Cody.

The skull showed no evidence of assault, but police ''have come up with possible ways on how she died,'' Cody said. It was not immediately clear how long the girl had been dead.

A description sent on the state police teletype said the remains included teeth braces, prompting detectives to take Antonella's dental records to the coroner in Westchester County, just north of New York City, McConville said.

The girl was last seen leaving a bank in the borough of Queens after depositing checks for her father. Her disappearance set off a search using bloodhounds and helicopters, and a $40,000 reward was posted.

Police scuba divers checked Flushing Bay; friends and neighbors of her family helped in the search. Thousands of posters were put up.

The girl's parents, Joseph and Marie Mattina, received word of their daughter's death on Monday.