SECOND SERIES: PULMONATA 



MANUAL 



OK 



CONCHOLOGY 



VOL. XXVI 



PUPILLIM: 



, PUPILLIN.E) 



BY 



HENRY A. PILSBRY, Sc.D. 



/f I? 



\j -- 





PHILADELPHIA: 

 PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 

 I920-I92I 



