by F.W. Gamble . Nemertines / by L. Sheldon . Thread-worms and Sagitta / by A.E. Shipley . Rotifers / by Marcus Hartog . Polychaet worms / by W. Blaxland Benham . Earthworms and leeches / by F.E. Beddard . Gephyrea and Phoronis / by A.E. Shipley . Polyzoa / by S.F. Harmer. -- Macmillan, 1896. -- (The Cambridge natural history / edited by S.F. Harmer and A.E. Shipley ; vol. 2).