SECOND SERIES: PULMONATA 



MANUAL 



OF 



CONCHOLOGY 



VOL. XXIV 



PUPILLID^: (GASTROCOPTIN^E) 



BY 



HENRY A. PILSBRY, Sc.D. 



Special Curator of the Department of Mollusca, 

 Academy of Natural Sciences of Philadelphia 



PHILADELPHIA : 

 PUBLISHED BY THE CONCHOLOGICAL DEPARTMENT 



ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 

 I9I6-I9I8 



