136 



EOCENE AND LOWER OLIGOCENE COEAL FAUNAS. 



Tlie .species is based on two .specimens, each of which is attached to a 

 valve of Barhatia cuculloides (Conrad). 



Locality. — Montgomeiy, Louisiana. 



Horizon. — Jacksoniaii stage. 



Types.— PI. XIV, fig. 7, in the United States National Museum; PL 

 XIV, figs. 6, 6a, in the collection of the Wagner Free Institute of Science. As 

 the latter is the more satisfactory specimen, if one specimen should be 

 designated as the type, it should be that one. 



The material on which this species is based is not altogether satis- 

 factory, as the amount and limits of variation can not be determined. 

 However, it presents so many points of difference from the preceding 

 Astrangia expansa that it does not seem possible for them to grade into 

 each other. There are five points of difference: The calices of A. Indovi- 

 ciana are much smaller, the septa are fewer, the columella is smaller and 

 weaker, the surface of the basal expansion has less pronounced striations or 

 none at all, and the costa.' on the outer surface of the corallite are not so 

 well developed. 



Astrangia habrisi sp. iiov. 

 PI. XIV, figs. 8 to 10a. 



1894. Harris, Tertiary geology of southern Arkansas: Annual Report Geological 

 Survey of Arkansas, 1892, Vol. IT, p. 172. (The undeteriuined coral 

 from three-quarters of a mile above Viuces Bluff, Saline River — partial 

 type of the species.) 



Colony more or less incrusting, reproduction both from basal expansion 

 and by lateral gemmation. The corallites are crowded, prominent, and 

 often appear tufted. When budding takes place from the basal expansion, 

 it is at the base of the older corallite. The heiglit of the corallites depends 

 on age; they quite often reach (i.S mm. Tlie costa^ coiTCspond to all cycles 

 of septa; they are low, nearly always broad, and rounded in profile, with 

 many small granulations scattered over them. The calices are elliptical. 

 The size varies much according- to ao-e. The followino- measurements of 

 adult or nearly adult calices will give an idea of their size: 



