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