ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL and SYSTEMATIC 



SECOND SERIES: PULMONATA. 



BY 



HENRY A. PILSBRY 



Part 



1 1 u im. 



PHILADELPHIA : 



PUBLISHED BY THE DEPARTMENT OF MOLLUSCA 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA 



APR - 2 193t 



