30 PEOF. P. MARTIN Duncan's eeyision of the 



well-developed costse, bearing a succession of small spines with 

 widely open capacious fossa. Septa usually extremely exsert, the 

 exsert quinaries, or quaternaries where these are not present, 

 lying next to the primaries, higher than the tertiaries, or equal to 

 them. Columella short, or little prominent. 



Distribution. — JRecent. South Atlantic, Azores, Sydney. 



This well-marked genus has very decided spines on the costse 

 in some species, and it has shallow forms and moderately tall ones. 

 It is allied to the two genera Bracliytrochus and Sabinotrochus, 

 but is distinct. 



Grenus Discoteochus, MM. Milne-JEdioards Sf Jules Haime, 

 Ann. des. Sci. Nat. 3^ ser. t. ix, p. 251 (1848). 



The corallum is simple, free, discoid. The calice is subplane ; 

 and the columella is fascicular and papUlary. The septa are 

 slightly exsert beyond the calice. The wall is horizontal and 

 costulated. 



Distribution. — Fossil. Eocene of Alabama ; Miocene of Turin. 



Gi-enus Cyclocyathtjs, MM. Milne-Edioards Sf Jules Haime, 

 Brit. JFoss. Corals, p. xiv, 1850 (Pal. Soc. Lond.). 



The corallum is simple, free, adherent when young, with a 

 horizontal wall and very thin epitheca. The septa are subcrenu- 

 late, and the pali are large and before the penultimate cycle. The 

 columella is fasciculate and papillary. 



Distribution. — Fossil. Grault : England. 



Grenus Brachtctathus, MM. Milne-Edwards Sf Jules Haime, 

 Ann. des Sci. Nat. 3' ser. t. ix. p. 295 (1848). 



The corallum is simple, very short, subpedicellate, and free. 

 The septa are exsert and narrow ; and the pali, in one crown, are 

 large, broad, and entire. Calice circular and subplane. Colu- 

 mella fasciculate, and of cylindrical processes, pajDillary. Costge 

 indistinct. 



Distribution. — Fossil. Neocomian : Hautes Alpes. 



The West-Indian Miocene form is not of the genus. 



Grenus Anthemiphtllia, Pourtales, reconsidered, ' Blake ' Corals, 

 1878-79, p. 112. 

 Corallum flat or low, free or pedicellate. Columella spongy 

 and coarse, flat above, and fasciculate. Spines of septa trans- 



