TEEATISE ON ZOOLOGY 



EDITED BY 



EAY ; ^ANKESTER 



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



HON. FELLOW OF EXETER COLLEGE, OXFORD ; DIRECTOR OF THE NATURAL HISTORV 

 DEPARTMENTS OF THE BRITISH MUSEUM 



PART V 



MOLLUSCA 



BY 



PAUL PELSENEER, D.Sc. 



LONDON 



ADAM & CHARLES BLACK 

 1906 



