SECOND SERIES: PULMONATA. 



MANUAL 



C0NCH0L0GY 



Structural and Systematic 



WITH ILLUSTRATIONS OF THE SPECIES 



FOUNDED IIY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc.D., 



Special Curator Department of Mollusca, Academy of Natural 

 Sciences of Philadelphia. 



pan $07 Plain. 



PHILADELPHIA : 



PUBLISHED BY THE ( ONTHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



