'7/ 



SECOND SERIES: PULMONATA. 



MANUAL 



CONCHOLOGY 



Structural and Systematic 



WITH ILLUSTRATIONS OF THE SPECIES 



FOITNDED ItY 



GEORGE W. TRYON, jR. 



CONTINOKD BY 



HENRY A. PILSBRY, Sc.D., 



Special Curator Department of Mollusca, Academy of Natural 

 Sciences of Philadelphia. 



pofft 12 flail). 



PHILADELPHIA : 



PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



NOV 7 1935 



