SECOND SEKIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC 



WITH ILLUSTKATIONS OF THE SPECIES 



VOIv. XXI 

 ACHATINELLID^E 



(AMASTRIN^E) 



BY 



ALPHEUS HYATT 



AND 



HENRY A. PELSBRY 



LEPTACHATINA BY C. MONTAGUE COOKE 



PHILADELPHIA : 

 Published by the Conehologieal Department 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 

 1911 



