'7? 



SECOND SERIFS: PULMONATA. 



MAN UAL 



OF 



J 



STRUCTURAL AND SYSTEMATIC. 



WITTl ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONTINUATION BY 



HENRY A. PILSBRY, 



CONSERVATOR OF THE CJNCHOLOGICAL SECTION AND PROFESSOR OF MALACOLOGY 

 IN THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



Vol. IX. 



(HELICID.E, VOL. 7.) 



GUIDE TO THE STUDY OF HELICES. 





PHILADELPHIA : 

 3Pu.blish.ed by Concliological Section 



ACADEMY OF NATURAL SCIENCES, 

 OF PHILADELPHIA. 



1894. 



