SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL MD SYSTEMATIC. 



WITH ILLUSTKATIONS OF THE SPECIES. 



FOUNDED BY 



GEORGE . TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRT, Sc. D., 



CONSERVATOR or THE CONCHO LOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



VOL. XVI. 

 UROCOPTIDJE, ACHATINID.E. 



PHILADELPHIA: 

 Published by the Conehologieal Section, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 

 1904. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 



