Adriana Caselotti, 80, Voice of Snow White

Adriana Caselotti, who as a convent-educated teen-ager in the 1930's was chosen to be the voice of Snow White in Walt Disney's first feature-length cartoon, died on Sunday at her home in Los Angeles. She was 80.

She died of cancer, the Disney studio said.

She was 18 when Walt Disney personally hired her for ''Snow White and the Seven Dwarfs,'' which was released in 1937. As the company recounts it, the studio had been searching for a voice that was ''ageless, friendly, natural and innocent'' for Snow White, who would introduce the world to the song ''Someday My Prince Will Come.''

Miss Caselotti got a recommendation for the role when a Disney casting scout asked her father, a Los Angeles voice coach, if any of his students had a voice beguiling enough for the role. More than 150 singers had already auditioned. Among those Miss Caselotti beat out was the actress Deanna Durbin.

In a 1993 interview, Miss Caselotti said she was paid $20 a day to sing and read the lines for the role, for a total of $970, and that she did not realize she was working on a full-length animated film.

''They had told me that it was going to be a little longer than their shorts, which were 10 to 12 minutes,'' she said. ''So I thought it would be 20 minutes long or so. I didn't realize what had happened until I went to the premiere. I saw all these movie stars -- Marlene Dietrich, Carole Lombard, Gary Cooper -- everybody was there. I discovered this thing was an hour and 23 minutes.''

After ''Snow White,'' she briefly pursued an opera career, dabbled in real estate and the stock market, had a bit part in ''The Wizard of Oz'' and wrote a book on singing.

Miss Caselotti, who was divorced, is survived by a sister, Louise.