92 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th See. 



Cardium brewerii Gabb 

 PI. 14, Fig. 9 



C. brewerii Gabb, Pal. Cal., vol. 1, p. 173, pi. 24, fig. 155. 



Shell moderate in size, subequilateral, altitude about equal to 

 the length ; beaks central, strongly incurved, hinge line straight. 

 Anterior margin forms regular curve with base; posterior sub- 

 margin rounded and forming angle with posterior cardinal 

 margin above ; umbonal ridges high and convex, posterior 

 slightly concave ; surface ornamented by about 24 uniform, 

 subflattened ribs with flat interspaces; interspaces crossed by 

 numerous squamose lines which are less prominent on the ribs. 

 Locality 7, L. S. J. U. Pal. Coll. 



Corbula dilatata, new species 

 PL 15, Fig. 2 



C. parilis Arnold, U. S. G. S. Bull. 398, pi. 24, fig. 2. 



"Shell small, thick, very convex, equivalve, somewhat in- 

 equilateral ; beaks prominent, broad, strongly incurved and in- 

 clined forward. Anterior end sloping downwards ; abruptly 

 and regularly rounded below ; posterior obliquely truncated and 

 biangular; a distinct umbonal ridge passes from the beaks to 

 the posterior angle in both valves. Basal margin of right valve 

 regularly and broadly convex, straight on the left." Surface 

 marked by prominent concentric band-like ribs, the upper edges 

 of which are angulated. Locality 8, L. S. J. U. Pal. Coll. 



This species differs from C. parilis Gabb^® by not having any 

 radiating sculpture. There is a big contrast also in the general 

 outline and convexity of the shell. 



Cucullaea morani Waring 



PI. 14, Figs. 12 and 13 



C. morani Waring, Jour. Geol., vol. 22, no. 8, p. 784, Nov.- 

 Dec, 1914. 



Shell thick, oblique, very convex ; beaks large, broad, prom- 

 inent and about one-third the distance from the anterior, in- 

 curved and somewhat remote; area oval in shape and about 

 two-thirds the length of the shell ; anterior margin broadly 



<" Pal. Cal., vol. 1, p. 150, pi. 29, figs. 239-239a. 



