74 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Silr. 



truncated as is K. occidentalis. Ventral valve slightly more con- 

 vex than the dorsal, and the umbone short and incurved ; beaks 

 of both valves divided longitudinally by a median septum that 

 extends about halfway to the front margin. Locality 4, L. S. 

 J. U. Pal. Coll. 



Pelecypoda 



Cardium cooperii Gabb 



PI. 13, Fig. 3 



C. cooperii Gabb, Pal. Gal. Sci., vol. 1, p. 172, pi. 24, fig. 

 154a. 



Shell broad, cordate, equilateral ; beaks small, central, prom- 

 inent ; cardinal margins sloping and rounded on both sides ; 

 base regularly convex ; surface marked by many minute, 

 rounded radiating ribs, which are larger on posterior third of 

 shell. Locality 4. This species occurs also in the Tejon. L. 

 S. J. U. Pal. Goll. 



Crassatellites branneri Waring 



PI. 14, Fig. 17 



Crassatellites branneri Waring, Jour. Geol., vol. 22, no. 8, 

 pp. 782-6, Nov.-Dec, 1914. 



Shell very large, trigonal, slightly longer than high ; beaks 

 subcentral, prominent, deeply excavated front and back, in- 

 curved, with sides sloping equally and rapidly, most abrupt in 

 advance, slightly convex behind ; lunule cordate ; anterior end 

 broadly rounded ; posterior truncated and flattened from the 

 umbonal ridge to the cardinal and posterior margins ; surface 

 marked by lines of growth and fine radiating lines which are 

 especially apparent on worn specimens. Locality 4, L. S. J. U. 

 Pal. Goll. 



Named in honor of Dr. J. G. Branner of Stanford Uni- 

 versity. 



Crassatellites grandis Gabb 



PL 12, Fig. 16 



C. grandis Gabb, Pal. Gal, vol. 1, p. 181, pi. 24, fig. 163. 

 Shell large, longer than high ; beaks prominent ; excavated 

 both anteriorly and posteriorly ; anterior cardinal margin slop- 



