SECOND SERIES: PULMONATA. 



MANUAL 



C0NCH0L0GY 



Structural and Systematic 



WITH ILLUSTRATIONS OF THE SPECIES 



KlirXliKII itv 



GEORGE W. TRYON, Jr. 



i'hNTINTKI) BY 



HENRY A. PILSBRY. Sc.l).. 



Special Curator Department op Mollusca, Academy op Naturae 

 Sciences or Philadelphia. 



Part 



JC8 Plain. 



PHILADELPHIA : 



PUBLISHED BY THE C'ONCHOLOGICAL DEPARTMENT 



ACADEMY OP NATURAL SCIENCES 



OF PHILADELPHIA. 



