SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC 



WITH ILLUSTRATIONS OF THE SPECIES 



FOUNDED FJY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc.D., 



SPECIAL CURATOR DEPARTMENT OF MOI/LTJSCA, ACADEMY OF NATURAL 



SCIENCES OF PHILADELPHIA. 



Part 



PHILADELPHIA : 



PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



