T 



7 



C 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL and SYSTEMATIC 





SECOND SERIES: PULMONATA. --1^ "^"k^ 



BY 



HENRY A. PILSBRY 



P„. LI' P^n- 



PHILADELPHIA: 



PUBLISHED BY THE DEPARTMENT OF MOLLUSCA 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA 



JUN 14 1934 



