TREATISE ON ZOOLOGY 



EDITED BY 



E. RAY LANKESTEB 



M.A., LL.D., F.R.S. 



HONORARY FELLOW OF EXETER COLLEGE, OXFORD ; CORRESPONDENT OF THE INSTITUTE 



OF FRANCE ; DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS 



OF THE BRITISH MUSEUM 



PART III 

 THE ECHINODEKMA 



BY 



F. A. BATHER, M.A. 



ASSISTANT IN THE GEOLOGICAL DEPARTMENT OF THE BRITISH MUSEUM 



ASSISTED BY 



J. W. GREGORY, D.Sc. 



LATE ASSISTANT IN THE GEOLOGICAL DEPARTMENT OF THE BRITISH MUSEUM 

 PROFESSOR OF GEOLOGY IN THE UNIVERSITY OF MELBOURNE 



AND 



E. S. GOODRICH, M.A. 



ALDRICHIAN DEMONSTRATOR OF ANATOMY IN THE UNIVERSITY OF OXFORD 



LONDON 

 ADAM & CHARLES BLACK 



1900 



