SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC 



WITH ILLUSTRATIONS OF THE SPECIES 



FOUNDED HY 



GEORGE W. TRYON, JR. 



OONTINUKD BY 



HENRY A. PILSBRY, Sc.D., 



SPECIAL CURATOR DEPARTMENT OF MOLLUSCA, ACADEMY ov NATURAL 



SCIENCES OF PHILADELPHIA. 



Part 



4 



PHILADELPHIA : 



PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES 



OF PHILADELPHIA. 



