Volume Ii

FLATWORMS AND MESOZOA

By F. W. GAMBLE, M.Sc. (Vict.), Owens College

NEMERTINES

By Miss L. SHELDON, Newnham College, Cambridge

THREAD-WORMS AND SAGITTA

By A. E. SHIPLEY, M.A., Fellow of Christ's College, Cambridge

ROTIFERS

By MARCUS HARTOG, M.A., Trinity College, Cambridge (D.Sc. Lond.), Professor of Natural History in the Queen's College, Cork

POLYCHAET WORMS

By W. BLAXLAND BENHAM, D.Sc. (Lond.), Hon. M.A. (Oxon.), Aldrichian Demonstrator of Comparative Anatomy in the University of Oxford

EARTHWORMS AND LEECHES

By F. E. BEDDARD, M.A. (Oxon.), F.R.S., Prosector to the Zoological Society, London

GEPHYREA AND PHORONIS

By A. E. SHIPLEY, M.A., Fellow of Christ's College, Cambridge

POLYZOA

By S. F. HARMER, M.A., Fellow of King's College, Cambridge

London MACMILLAN AND CO., LIMITED NEW YORK: THE MACMILLAN COMPANY 1901

All rights reserved

'Nous allons faire des vers ensemble' ANDRÉ DE CHÉNIER

First Edition 1896. Reprinted 1901

CONTENTS

PAGE

SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK ix

PLATYHELMINTHES AND MESOZOA