/ 



SECOND SEEIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC 



WITH ILLUSTRATIONS OF THE SPECIES 



VOL. XXII 

 ACHATINELLID^E 



BY 



HENRY A. PILSBRY 



ASSISTED BY 



C. MONTAGUE COOKE j 



GENEALOGY AND MIGRATIONS OF THE ACHATINELLID^J 



BY 



ALPHEUS HYATT 



PHILADELPHIA : 

 Published by the Conchological Department 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 



1912-1914 



