MAN UAL 



OP 



ONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W, TRYON, JR. 



CONTINUATION BY 



HENRY A. PILSBRY, 



CONSERVATOR OF THE CONCHOLOGICAL SECTION OF THE ACADEMY OF 

 SCIENCES OF PHILADELPHIA. 



Vol. XIV. 



POLYPLACOPHORA, 



(Chitons.} 



LEPIDOPLEURID^:, ISCHNOCHITONID^, CHITONID^, MOPALIID^i. 



PHILADELPHIA : 

 Published by Conch.olocri.oal Section, 



ACADEMY OF NATURAL SCIENCES, 

 OF PHILADELPHIA. 



1892. 



i JF CALIFORNIA 

 BAVIS 



