ANTHOZOA—HEXACORALLA. 



103 



In the Claibornian and Jacksonian groups of Alabama, Missis- 

 sippi, Louisiana and Texas. 



LVII. Oculina Lamarck. 

 Composite corals generally in the form of branching stems with 

 the calices spirally distributed over the stem, generally on crater- 



FlG. 168. Oculina Fig. 169. Oculina 



vicksburgemis . m ississippiensis. 



(After Vaughan, Mon. U. S. G. S. ) 



like elevations and separated by dense layers of ccenenchyma. 

 Septa in several cycles, the longer reaching the center which is 

 occupied by a papillose columella surrounded by a cycle of vertical 

 rods or pali. Tert -Recent. 



139. 0. vicksburgensis (Conrad). (Fig. 168.) Oligocenic. 

 Branches 20 to 30 mm. in thickness. Circular calices separated 



by once or twice their diameters or more, shallow, but often with a 

 prominent margin. Feeble flexous striae radiate from the calices 

 on the ccenenchyma. Diameter of adult calyx averaging 4 mm. 

 In the Vicksburgian and Red Bluff beds of Mississippi. 



140. 0. mississippiensis (Conrad). (Fig. 169.) Oligocenic. 

 Calices strongly projecting, crowded, with thin septa. Costal 



striae faint or obsolete. 



In the Vicksburgian group of Mississippi. 



