CONTENTS. I.—A Short History of the Study of Mycetozoa in Britain ... ... ... ... 1 II.—An Account of the Habitats of the Mycetozoa GENERALLY ... ... ... ... 13 III.—A List of Species of Mycetozoa recorded from Essex ... ... ... .. 33 IV.—Tables of Species recorded from (1) Essex, (2) Beds, Bucks and Herts, (3) Somerset and Devon, and (4) Aberdeen, Elgin, and Nairn ... 46 Index .....................51 Frontispiece :— Three Species of Mycetozoa first found in ESSEX.