



MANUAL 



OF 



STRUCTURAL AND SYSTEMATIC. 







WITH ILLUSTRATIONS OF TTIR SPECIES. 



BY GEORGE W.(jRYON)jR. 



<'ON*H:VAT<>U >K TIIE < '.'XcHor.o.;: . r.MV rP N 



.".n\. 



vcn ,. rv. 

 NASSID, TURBINELLiO/ii, VOLUTION, MITRID.xE. 





PHILADELPHIA: 

 Published by the Author, 



ACADEMY OF NATURAL ECIENCES. COR. I9TH & PA^ 

 1882. 



