SECOND SEEIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL SND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



FOUNDED BY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENEY A. PILSBRY, So. D., 



SPECIAL CURATOR OF THE DEPARTMENT OF MOLLUSCA, ACADKMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



VOL XVII. 



AFRICAN ACHATINID.E. 



PHILADELPHIA : 

 Published by the Conehologieal Department, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



1904-1905. 



LIBRARY 



OF CALIFORNIA 



