SECOND SERIES: PULMONATA. 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURAL SND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



POUNDED BY 



GEORGE . TRYON, 



CONTINUED BY 



HENRY A. PILSBRY, Sc. D., 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



Vol. 



AUSTRALASIAN BULIMULID^E : BOTHRIEMBRYON, PLACOSTYLUS. 

 HELICID^E : AMPHIDROMUS. 



PHILADELPHIA: 

 Published by the Conehologieal Section, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 

 1900. 



