120 EOCENE AND LOWEE OLIGOCENE CORAL FAUNAS. 



OCULINA SINGLEYI Sp. TIOV. 



PI. X, figs. 1 to 2a; PI. XII, flgs. 1 to 3a. 



Colony ramose, branches attaining almost 2 cm. in diameter, irregular 

 in form, but usually subcylindrical. Coenencliyma thick and very dense; 

 surface granulate and ornamented in addition thereto by fine flexuous stria?. 

 Calices deep, circular, size varying greatly; the young calices on young 

 branches or the young calices on old branches are much smaller than the old 

 calices; diameters, from 1.75 to 4 mm.; usual size, from 2. .5 to 3 mm. ; distri- 

 bution on the corallum irregular, on young branches they may be slightly 

 crowded, on old bi-anches they may be very distant, but the distance from 

 one calice to that standing nearest to it rarely or never exceeds twice its 

 diameter; margins usually prominent. On the outside of the projecting 

 part of the corallites are prominent granulate costiB alternating in size. 

 They project sliglitlv above the calicular mai'gin and connect with the 

 corresponding septa. Septa rather weak, in many instances very frail, or 

 they may be rather stout, sides granulate; margins minutely dentate; 

 three com2:)lete cycles; six systems. In the largest-sized calices there are 

 frequently a variable number of members of the fom-th cyclfe. Pali small 

 and fragile or fairly large, irregular in shape before all cycles of septa 

 except the last. Colun:iella moderately developed, spongy. 



Localities. — Smith villc, Bastrop Country, Texas; Moseleys Ferry, Brazos 

 Rivei', Burleson County, Texas; Wheelock, Robertson County, Texas; 

 Alabama Bluff, Trinity River, Houston County, Texas. 



Geologic occurrence. -LoWCr Claibome. 



Types. — From collection of J. A. Single}" deposited in the United States 

 National Museum. Specimens represented in PI. X, figs. 1 to 2a, from col- 

 lection of Wagner Free Institute of Science. 



This species resembles Oculina mississippiensis of Conrad rather 

 closely, but it may be separated from the latter species chiefly by its 

 deeper calices and tlie prominent costas on the outside of the elevated 

 portion of the corallites. These characters are well expressed in PI. XII, 

 fio-.s. 2a and 2b. 



