SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 103 



CONTRIBUTIONS TO THE GEOLOGY AND PALEON- 

 TOLOGY OF THE CANAL ZONE, PANAMA, AND 

 GEOLOGICALLY RELATED AREAS IN CEN- ' 

 TRAL AMERICA AND THE WEST INDIES 



FOSSIL ECHINI OF THE PANAMA CANAL 

 ZONE AND COSTA RICA 



By ROBERT TRACY JACKSON 



Of Peterborough, New Hampshire 



Extract from Bulletin 103, pages 103-116, with Plates 46-52 



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WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1918 



