i 



CONTRIBUTIONS TO THE GEOLOGY AND PALAEONTOLOGY 



OF THE WEST INDIES 



X FOSSIL ECHINI OF THE WEST INDIES 



By ROBERT TRACY JACKSON ' 



STRATIGRAPHIC SIGNIFICANCE OF THE SPECIES 

 OF WEST INDIAN FOSSIL ECHINI 



j* 



By THOMAS WAYLAND VAUGHAN X 





PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 



WASHINGTON, 1922 



