96 



eocej^e and lower oligocene coral faunas. 



tliey may be shown to be the same. Should the hatter prove true, Soko- 

 low's name should stand, as Conrad did not describe his species sufficiently 

 clearly and did not figui-e it at all. Sokolow wrote a splendid description 

 of his species, and published exquisite figures of it. 



Trochocyathus californianus sp. nov. 



PI. VII, figs. 10 to 13. 



Corallum discoid, attached at the middle of the base, which is almost 

 flat, very slightly convex or concave. Measurements of four specimens are: 



Diameter of corallum. 

 Height of corallum.-. 



Mm. 

 6 

 2.25 



Mm. 



Mm. 



7 

 2.75 



Mm. 

 . 7 

 2.5 



Costse correspond to all septa. They are low, rather thick at the 

 wall, but with a subacute edge, finely granulate, and equal. There is no 

 perceptible alternation or diff'erence in size. There are three complete 

 cycles of septa, and ver}- nearly all the members of the fourth. They 

 are thin, their upper margins arched from the wall to the calicular fossa. 

 Peripherally, occasional dentations on the margins ; faces granulate. Pali 

 are present. They are thin, and before some septa broad, but the details 

 can not be ascertained. Calicular fossa shallow, calice widely open. 

 Columella fascicular, composed of erect rods rising from the base. 



Locality. — Sau Joaquiu coal mine, California. 



Geologic horizon. CrCtaCCOUS ? 



Types. — Four sjjecimens sent to me liy Dr. J. C. Merriam, University of 

 California, and returned to him. One specimen has been presented by Dr. 

 Merriam to the United States National Museum. 



This species is extremely close to Tr. InniiJitiforniis; in fact, the 

 specific differences here pointed out are not thoroughly satisfactory. 

 The specimens of Tr. luimlitiformis have the cycles of costa- indicated by 

 'corresponding sizes, (jr they alternate in size. The costiT? of Tr. califor- 

 nianus are, as above stated, equal. This difference seems good, but when 

 more specimens of the latter have been discovered, and the details of the 

 pali and columella can V)e worked, still oiher differences may be found. 



