^ 



SECOND SERIES: PULMONATA. 



MANUAL 



C0NCH0L0GY 



Structural and Systematic 



WITH ILLUSTRATIONS OF THE SPECIES 



FOUNDED HY 



GEORGE W. TRYON, JR. 



CONTINUED RY 



HENRY A. riLSBRY. Sc.D.. 



Special Curator Department of Mollusca, Academy of Natural 

 Sciences op Philadelphia. 



Part 





PHILADELPHIA : 



PUBLISHED r.Y THE CON< IK >!.<>< HI !AL DEPAETMENT 



A< \I»K.MY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



