

SECOND SERIES: PULMONATA 



MANUAL 



OF 



CHOLOGY 



VOL. XXIV 



PUPILLIM: (GASTROCOPTIN^:) 



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 



