Erratum

Volume 47, Number 1, 1974, in the article "Ultrastructural Analysis of Nucleolar Evolu- tion in the Rat Primary Oocyte," by Fioretta Palombi and Mari Stefanini, pp. 61-73.

Page 72. Line 13 should read: "in the nucleolus and the disappearance of the mature form of rRNA was. . ."