SECOND SEEIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC 



WITH ILLUSTEATIONS OF THE SPECIES 



VOL. XXI 

 ACHATINELLID^: 



(AMASTRIN.E) 



BY 



ALPHEUS HYATT 



AND 



HENRY A. PILSBRY 



LEPTACHATINA BY C. MONTAGUE COOKE 



4? A 





PHILADELPHIA : 



Published by the Conehologieal Department 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 

 1911 



