SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCtiOLOGY 



STRUCTURAL AND SYSTEMATIC 



WITH ILLUSTRATIONS OF THE SPECIES 



FOUNDED BY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc.D., 



SPECIAL CURATOR DEPARTMENT OF MOLLUSCA, ACADEMY OF NATURAL 

 SCIENCES OF PHILADELPHIA. 



Part 



PHILADELPHIA : 



PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



