1916] Nomland: Corals from Cretaceous and Tertiary of California 61 



The writer is indebted for criticism and advice to Professor J. 

 C. Merriam, who a number of years ago made an extensive study of 

 California corals and first used them for correlating purposes in the 

 Martinez. Acknowledgment is due to Dr. R. E. Dickerson, whose 

 extensive studies in the California Eocene have made a large part of 

 this work possible. 



The writer wishes especially to express his gratitude to Dr. T. 

 Wayland Vaughan of the United States Geological Survey for 

 examination of the manuscript and criticism of the palaeontological 

 determinations. 



Description of Species 

 TURBINOLIA DICKERSONI, n. sp. 

 Plate 3, figures 5, 6, 7, 8 



Type, University of California Department of Palaeontology collections. The 

 type is from locality 1817, near center of sec. 15, T. 18 S, R. 13 E, M. D. B. & M., 

 Fresno County, California. 



Corallum conical. Costae 24, prominent, only six reaching the base, 

 of nearly the same thickness at thecal wall and margin, the twelve 

 longer costae appear but slightly widened near the base, margin flat- 

 tened. Intercostal furrows with double rows of pores, in some of the 

 larger specimens a low ridge appears between the rows on upper por- 

 tion. Septa corresponding in number to the costae, those of the 

 primary cycle slightly larger at the calieular margin. On lateral faces 

 of septa are numerous rows of granules extending from wall to septal 

 margin. The columella at the calice projects somewhat above the 

 margin of the septa and appears as a six-pointed star, the rays of 

 which are connected to the primary septa. Diameter of corallum, 

 2.8 mm. ; height, 6.7 mm. 



Occurrence at University of California localities 692, 1817, Tejon 

 group, Eocene. 



This species seems to resemble closely Turbinolia phareta Lea, as 

 described by Vaughan. T. dickersoni appears to differ, however, in 

 having the costae of nearly the same thickness at the margin and 

 thecal wall, the costae are not so much widened near the base, and 

 the septa are not of uniform size at the peripheral portion of the 

 calice. Also in T. dickersoni the rows of septal granules extend the 

 whole distance across the septa, although in some rows interrupted 

 about two-thirds of the distance from the wall. 



