

MAN UAL 



J 



ONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITTl ILLUSTRATIONS OF Till- si>K< 



BY GEORGE W. TRYON, JR. 



CONTINUATION BY 



HENRY A. PILSBRY, 



CoNSKKVATOK OK VHK CoXniouxiirAI. SECTION Ol THE 

 Ni.TlTRAL SCIKNCKS )K PlI I LADK1.1MI 1 A. 



Vol. XIV. 



POLYPLACOPHORA, 



( Chitons. ) 

 LEl'IDOl'LKURID.K, ISCHNOCH1TONID.K, CHITO> PAU1D 



PHILADELPHIA : 

 isluMl by Concholop-i<-<<l S<- 



ACADEMY OF NATURAL SCI i 



OF 1MIII.AD1 1 1MI1A 5 



