DESCRIPTIONS OF SPECIES. 139 



specimens of other corals labeled " Jacksonboro, Georgia," whose matrix is 

 lithologically the same as that of tlie Cladocora recrescens. In the United 

 States National Museum is a specimen of the species, and its matrix is the 

 same as that of the Lonsdale specimens. The locality is given "Eocene, 

 Rotten limestone, Georgia." It is quite probable that Lonsdale's specimens 

 and the one in the National Museum came from Jacksonboro, Georg-ia. 



The following notes are based on the specimen in the United States 

 National Museum. The specimen is simply a cast; therefore the details 

 can not be described in full. 



Neither the walls nor the septa are perforate, as Lonsdale stated originally. 

 He was misled by the appearances of the cast. The colony is more or less 

 dendroid, or bush-shaped, reproduction by lateral gemmation. The diam- 

 eter of the branches is 10 to 14 mm. Externally the costse are distinct, 

 well developed, but only moderately prominent (cf. PI. XV, fig. 3), alternately 

 larger and smaller. They are subacute, witli broad bases, and are granu- 

 late. At different levels around the corallite are projecting girdles; these 

 also are shown in PI. XV, fig. 3. The number of septa could not be made 

 out in detail and with absolute certainty, but by counting the costse it 

 seems that there were four complete cycles. The septal face granulate; 

 dissepiments evidently were very well developed, curving from the outside 

 inward and downward. The columella is well developed, moderately large 

 and vesicular. 



This species is very different from any other of our Eocene corals, and 

 sufficient data are furnished by the cast for its identification. 



Horizon. — Tliis is uot kuowu with absolute certainty, but most probably 

 it is Jacksonian, or lowest Oligocene. 



Grenera not placed in familie.s. 

 Genus DICHOCCENIA Milne-Edwards and Haime. 



DiOHOCfENIA ALABAMENSIS Sp. IIOV. 



PI. XV, figs. 4 to 4c. 



Corallum massive, subplane above. Calices elliptical or subcircular, 

 not very deep. Joined directly by their thick, solid walls; no exotheca. 

 The distances between the calices is usually from 3 to 4 mm., but it may 

 be only 1 mm., or as much as 5 nnii. The elliptical calices are about 6 

 mm. long by 3 mm. wide. One of the subcircular calices has a diameter of 

 3 mm. Costse are present, but their details could not be made out. Multi- 



