208 PALAEONTOLOGY OF CALIFORNIA. 



well-marked alternation of larger and smaller ones. Surface of 

 calicle unknown. 



Figure, twice natural size. 



Locality: Division B., near the coal-mines at Mount Diablo. 



SUBGEN. ELLLPSOSMILIA, D'Orb. 



? T. GRANULIFERA, n. S. 

 PI. 26, Fig, 196, and 196 a. 



POLYPIDOM trochiform, robust, elliptical above, attached by a 

 broad base ; surface marked by impressed striae, each one cor 

 responding to the space between two of the septa ; between these 

 striae the surface is finely granulated. Septa thick, not very nu 

 merous, granular on the sides, as seen from above, narrow on 

 the upper margin. 



Figure, three times natural size. 



Locality : Bare in Division A., near Chico Creek. 



ASTROCGENIA, E. and H. 



? A. PETROSA, n. 8. 

 PI. 31, Fig. 274, and 274 a. 



POLYPIDOM dendroid and massive, the branches subcylindrical 

 and dichotomous ; cells circular, disposed irregularly, somewhat 

 remote, surrounded by thick walls; columella projecting beyond 

 the edges of the septa, but not reaching as high as the top of the 

 cup. Septa twenty-four in number, thin, somewhat irregular; 

 walls between the cells massive, solid, striated. 



Figures, natural size and magnified. 



Locality : All of the specimens were obtained from a single mass of limestone, 

 a mile west of Martinez. 



