SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL SNDJSYSTEMSTIC. 





i (LI 

 WITH ILLUSTRATIONS OF THE SPECIES^ 



POUNDED BT 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc. D., 



CoXSKRVATOR OP THE CONCHOLOGICAL SECTION OF THE At'ADEMY OK 

 NATURAL SCIENCES OP PHILADELPHIA. 



Vol. XIII. 



AUSTRALASIAN BULIMULID.E : BOTHRIEMBRYON, PLACOSTYLTS. 

 HELICID.E : AMPHIDROMUS. 



PHILADELPHIA: 

 Published by the Conehologieal Section, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



1900. 



