ELECTRON MICROSCOPE STUDIES ON OOCYTES AND ECHINODERM, THYONE BRIAREUS, WITH SPECIAL REFERENCE TO THE ORIGIN AND STRUCTURE OF THE ANNULATE LAMELLAE.

ELECTRON MICROSCOPE STUDIES ON OOCYTES AND ECHINODERM, THYONE BRIAREUS, WITH SPECIAL REFERENCE TO THE ORIGIN AND STRUCTURE OF THE ANNULATE LAMELLAE.