Cladophyllia, Piionastrtea, and Stylina. 



459 



Distribution. — Eocene, Hunts ville, Alabama. Coll. Brit. 

 Mus., R. 4146. 



Fig:. 2 a. 





Fig. 2 a. — Part of the surface, showing one corallite undergoing fission. 



X G diam. 

 Fig. 2 b. — A corallite from the side. X 6 diam. 



Affinities. — My attention was called to this species by 

 Mr. T. Wayland Vauglian, of the United States Geological 

 Survey, who noticed it while examining the American 

 Cainozoic corals in the British Museum. The coral was new 

 to him, but he had not time to describe the species. The 

 Museum records state that the specimen came from Alabama. 

 Mr. Vaughan informs me that the precise locality is no doubt 

 Huntsville. A section has recently been cut across the coral, 

 which shows that it belongs to the genus Prionastrfea, as the 

 corallites are directly united by their walls. It therein 

 differs from Favia, which it resembles by the occasional 

 growth and fission. 



Its nearest ally is probably Prionastrcea confertissima 

 (Rss.) *, from Castelgomberto, in wliich fission is more 

 frequent and the calices less regular in shape. 



* Favia confertissima, von Reuss, Anth. Castelg., Denk. Akad. Wiss. 

 Wien, vol. xxviii. 1868, p. lo2, pi. viii. fig. 5. 



