Report of National Museum, 1 893. — Merrill. 



Plate 18. 



Slab of Onyx Marble showing sharp reticulating veins. 

 Cat. No. ()1388, U. S. N. M. Peuiusula of Lower Califoruia. 

 Natural .size. 

 Colors whitish, ro.se tinted, witli red and lirowii veins. 



