FINE STRUCTURE OF NUCLEOLUS IN YOUNG OOCYTE OF A CENTIPEDE

The young oocyte of the centipede Scutigera forceps possesses numerous nucleoli which vary considerably in size. The electron microscope reveals them to be composed of small ribosome-like granules (probably RNP), relatively dense matrix, and, in some cases, a poorly defined nucleolonema. The appearance of lamellae at the surface of the nucleoli is of special interest. These consist of nucleolar material, are about 70 mμ in thickness, and of much greater width. They encircle the nucleolus, forming a relatively large concentric body, and in some instances probably extend from one nucleolus to another. In that case, the lamellae may represent a means of transfer from one nucleolus to another. © 1968 Springer-Verlag.