72 PSOP. p. MARTIN DTTlfCAN's KEyiSIOK OP THE 



III. Alliance DENDROSMILIOIDA. 



Astrseidse gemmantes with small subdendroid forms. The corallites 

 short. Columella spongy or parietal. Septa entire. Endotheca present. 

 Genus Pourta.losmilia, Duncan. 

 Genus Dendrosmilia, Ed. & H. 



G-enus Potjetalosmilia, Duncan. 



Syn. Blastosmilia, Duncan (a name preoccupied), Madrepo- 

 raria of the Deep Sea, Trans. Zool. Soc. vol. x. pt. 5, 1878, p. 244. 



Colony formed by repeated gemmations from the wall of the 

 parent corallite, and occasionally from the walls of buds. Coral- 

 lites conico -cylindrical, long, bent, except the straight parent, 

 and parallel with this last. Calices circular, deep. Columella 

 rudimentary, or as trabeculge from the septal ends. Septa 

 entire, thin, slightly exsert ; they project but slightly into the 

 calice, except the primaries and secondaries. Costae rudimentary 

 and only exist near the calices. "Wall thin, with a granular 

 epitheca closely attached. Dissepiments wide apart. 



Distribution. — Hecent. Mediterranean. 



It must be noticed that the parent corallite survives with 

 the buds and does not die, as in Anomocora and Coenosmilia. 



G-enus Dendeosmilia, Milne-Edwards Sf Jules Saime, Gompt. 



Mend, de VAcad. des Sci. t. xxvii. p. 468 (1848). 



Colony small, subdendroid, increasing by lateral and alternate 



gemmation. Corallites subturbinate, short, free by their sides. 



Calices suboval. Columella spongy, well developed. Septa entire, 



thin, close, very unequal and granulated on their sides. Costae 



broad, simple, and granular. Endotheca present. No epitheca. 



Distribution. — JFossil. Cretaceous and Eocene : Europe. 



IV. Alliance STYLOSMILIOIDA. 



Astraeidse gemmantes with fasciculate, tufted, dendroid forms. The septa 

 entire or dentated. The columella stout, styliform, or papillary. 

 Genus Stylosmilia, Ed. & H. 

 Genus Stylocora, Reuss. 

 Genus Stylocora, E. de From.^ 1872. 

 Genus Placophyllia, d'Orb. 

 Genus Donacosmilia, E. de From. 



Genus Sttlosmilia, Milne-JEdwards Sf Jules Saime, Hist. 



Nat. des Corall. vol. ii. p. 220 (1857). 

 Colony in tufts which are fasciculate. Gemmation lateral. 



