PROCEEDINQS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES. 



Third Series. 

 Geology. Vol. I, No. 5. 



The Tertiary Sea-Urchins of 

 Middle California. 



BY 



John C. Merriam. 



With Two Plates. 



Issued March 6, 1S99. 



SAN FRANCISCO: 



Published bv the Academy. 



1899. 



