SECOND SEKIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL AND SYSTEMATIC, 



WITH ILLUSTEATIONS OF THE SPECIES. 



POUNDED BY * 



GEORGE . TRYON, JR. 



CONTINUED BY 



HEKRY A. PILSBKY, So. D., 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



UROCOPTID.E. 



PHILADELPHIA : 

 Published by the Conehologieal Section, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



1903. 



