Contents

28 June 1974
Vol 184, Issue 4144

About The Cover

Equatorial and proximal views of three members of a spore tetrad of Lycospora from Lepidostrobus cone taken from the Lower Block Coal Member of Indiana, about 310 million years old (about X 5900). See page 1367. [Joan M. Courvoisier, Florida State Museum, Gainesville]