SECOND SERIES: PULMONATA 



MANUAL 



OF 



CONCHOLOGY 



STRUCTURSL UND SYSTEMATIC. 



WITH ILLUSTKATIONS OF THE SPECIES. 



POUNDED BY 



GEORGE W. TRYON, JR. 



CONTINUED BY 



HENRY A. PILSBRY, Sc. D., 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 NATURAL SCIENCES OF PHILADELPHIA. 



Vol. XIII. 



AUSTRALASIAN BULIMULID^E : BOTHRIEMBRYON, PLACOSTYLUS. 

 HELICID^E : AMPHIDROMUS. 



PHILADELPHIA: 

 Published by the Conehologieal Section, 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 

 1900. 



LIBRARY 

 UNIVERSITY OF CALIFORNIA 



DAVIS 



