MANUAL 



OF 



GEOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATIONS OF THE SPECIES. 



BY GEORGE W./TRYON) JR. 



/ 



CONSERVATOR OF TUK CONCHOLOGICAL SECTION OK TUK ACADEMY OF NATURAL 

 SCIENCES OF PHILADELPHIA. 



VOL. II. 



MURICIN^ PURPURINJE, 



^4y / 



4*4 f 



PHILADELPHIA: 

 Published by the Author, 



ACADEMY OF NATURAL SCIENCES, COR. ISTH & RACE STS. 



1880. 



