Dear Mel, I'm sorry to contradict you and I don't know who's right or wrong but I know those cemeteries very well for personal reasons, and according to a former colleage and friend historian of parisian cemeteries, Miss Taglioni is buried in Marseilles and not in the Père Lachaise.
As for Nijinski's grave, the statue is a gift of the Russian Federation.
Actually, we're both right. Taglioni was originally interred in St.-Charles Cemetery in Marseilles in 1884. In 1930, when her grandson Augusto's wife Louise de Heredia died, he decided to have a family plot in Pere LaChaise. He exhumed remains as necessary (his father, mother, and grandmother. He declined to have his grandfather in there! "Grandma didn't like him.") from other cemeteries, and reinterred them in region #94 Rue Pacthod of Pere LaChaise, just down the road from the ashes of Isadora Duncan. As Louise was a member, the Academie Francaise has perpetual care of the gravesite. There is nothing on this marker - a cross - to identify the Comtesse Gilbert de Voisins, Marie Taglioni, as the dancer.
If you went back to the Montmartre cemetery and brushed aside the retting pointe shoes, you will find an inscription which reads, "MARIE TAGLIONI/a sa mere bien aimée." (Rather poor form to upstage your mother like that!) This grave is under the perpetual care of the Institut Italien, not a bad bunch of folks to look after a Swedish girl - her maiden name was Karsten!
Anyway, this is kind of getting like The Wrong Box
. In 1950, when Nijinsky died and was buried in London, Serge Lifar, believing that the Taglioni grave in Montmartre was indeed Marie, fought legally for the remains of Nijinsky and in 1953 won the right to have them reinterred a few plots away from whom Lifar believed was the Sylphide. The statue now adorning his grave portrays A
Petrouchka, but is not in the historically correct costume for the ballet.