DESCRIPTIONS OF SPECIES, 



69 



Flabellum califoknicum sp. uov. 

 PL IV, figs. 11 to 12. 



Form cuneate, but usually curved in the plane of the shorter transverse 

 axis of the calice. Attached by a very short j^edicel. Cross section com- 

 pressed, elliptical. Surface costate; costre not very prominent; five on each 

 side, slightly larger than the others. Slight girdling depressions. Septa 

 about 52. 



Greater diameter of calice 

 Lesser diameter of calice . 

 Height of corallum 



Mm. 

 12.5 

 7.5 

 12 



Mm. 

 12 

 7 

 13.5 



Locality. — Tavo aiid a half miles northeast of Clayton, Contra Costa 

 County, California. (T. W. Stanton.) 



Geologic occurrence. — Tcjou bcds (upper part), abovc coal horizon. 



Types. — United States National Museum. 



The size and shape of the species, its indistinct costfB, and the usually 

 curved form of the corallum make it easily identifiable. This is the only 

 curved species that I know from the Eocene of the United States. 



The specimens are poorly preserved, and do not permit all of the details 

 of the structure to be worked out. 



Flabellum khomboideum sp. nov. 

 PI. IV, tigs. 13 to U. 



Shape, subcuneiform; seen from the side its outline subtriangular; 

 transverse outline of adult, as seen from above, rhomboid; both the edges 

 and the faces diverge at wide angles. The median portion of the faces is 

 abruptly swollen, as if it had been pu&hed out from within. Marginal wings 

 rudimentary or absent. The corallum is attached by a short i)edicel. 

 There are no costae. The epitheca is very thin, pellicular, and scales oflf 

 easily; it extends, however, to the calicular margin. When the epitheca is 

 broken away, impressed lines corresponding to the septa are revealed; 

 transverse lines of growth arranged en chevi'on. Wall thin and weak. 



