SECOND SE1UKS: PULMOXATA. 



MANUAL 



OF 



ONCHOLOGY: 



STRUCTURAL AND SYSTEMATIC. 



WITH mVTSTPxATIOXS 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. 



INDEX TO THE HELICES. 



PHILADELPHIA : 



3?ublish.ed by Concliological Section 



ACADEMY OF NATURAL SCIENCES, 



OF PHILADELPHIA. 



1895. 



