SKCOND SERIES: PULMONATA 



MANUAL 



OF 



ONCHOLOGY: 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W. TRYON, JR. 



CONTINUATION BY 



HENRY A. PILSBRY, 



CONSERVATOR OF THE CJNCHOLOGICAL SECTION AND PROFESSOR OF MALACOLOGY 

 IN THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



INDEX TO THE HELICES. 



PHILADELPHIA : 

 Fu.blish.ed by Concliological Section 



ACADEMY OF NATURAL SCIENCES, 



OF PHILADELPHIA. 



1895. 



LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



