458 Dr. J. W. Gregory on new Species of 



Affinities. — This species is most nearly allied to Glado- 

 phyilia crassilamella, From.*, from the Neocomian of Moraii- 

 com-t. From that form it differs by having more numerous 



Transverse section across two corallites. X 6 diam. 



septa, and especially by the coarse dentation of the septa. 

 The strong " columellar septum " is similar to that of 

 Pleurosmilia. 



2. Prionastrcea Vaughani, sp. n. 

 (From the Eocene of Alabama.) 



Diagnosis. — Corallum subarborescent, in simple cylindrical 

 branches. Walls thin. Calices deep, elliptical in shape. 

 Rims distinct, separated by shallow grooves. Corallites 

 mostly pentagonal ; occasionally quadrangular or hexagonal. 

 Septa about five orders, of which two or three unite 

 with the large columella. The septa are dentate ; on the 

 upper margin and laterally they are covered by short sharp 

 spines. 



Dimensions. — 



Diameter of branch 17 mm. 



„ corallite 4-5 „ 



„ columella 1'5 „ 



Depth of the calice 2 „ 



* E. de Fromentel, Pal. fran9. Terr. crt5t., Zooph. pt. 8, 1870, pi. xciii. 

 fig. I, pt. n, 1873, p. 417. 



