SECOND SERIES: PULMONATA. 



MANUAL 



CONCHOLOGY 



Structural and Systematic 



WITH ILLUSTRATIONS OF THE SPECIES 



FOUNDED liY 



GEORGE W. TRYON, Jr. 



OONTINUKD BY 



HENRY A. PILSBRY, Sc.D.. 



Speciai. Curator Department op Mollusca, Academy of Natural 

 Sciences of Philadelphia. 



109 Piain. 



Part 



PHILADELPHIA : 



PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



NOV 1 1 1927 



