DESCRIPTIONS OF SPECIES. 



159 



septal fusiou around it. Calicular fossae shallow. Reproduction takes place 

 b}^ budding from the costate area between the angles of the calices. 



Localities. — Prairic Creek, Alabama (United States National Museum); 

 eastern Wilcox County, Alabama (collection of T. H. Aldrich). 



Horizon. — Mldwaj beds ; "Turritella Rock," according to the label of 

 Mr. Aldrich's specimens. 



Types. — United States National Museum; specimens in the collection of 

 Mr. T. H. Aldrich. 



From a superficial study of this coral I at first made the mistake 

 of referring it to Stephanocoenia. By comparing the preceding description 

 with that given for Stephanoccenia fairbanski the general supei"ficial resem- 

 blance will be quite apparent, in snite of the two corals being essentially 

 very different. 



Genus MESOMOKPHA Pratz! 



MESOMOKPHA DUNCANI sp. DOV. 



PI. XYIII, figs. 8 to 10. 



1894. Thamnastraa duncani Vaughan nom. nud. Kept. geol. Coast. PI. Ala. : Ala. 

 Geol. Survey, 1894, p. 248. 



Corallum in rounded, rather low, more or less cap-shaped masses, base 

 almost flat. Two specimens in the National Museum that show the form 

 and size of the colony possess the following dimensions : 



Septo-costse flexuous, confluent from one calice to the next; distance 

 between calicinal centers 4 to 5 mm.; no walls between calices. The 

 cyclical aiTaugement of the septa not very definite; the number of septa 

 varies from 29 to 48. There are three complete cycles, with a greater or 

 less number of those of the fourth, the latter sometimes being complete. 

 The septa are crowded and have a decided tendency to form groups of 

 from three to five each. They are composed of ascending comjjletely 

 fused trabeculse, which stand vertical or are slightly inclined inward. No 



