FAMILIES AND &ENEEA OF THE MADEEPOEAEIA. Ill 



The following genus is not satisfactory in the face of the 

 possibility of Stylina having dentate septa : — 



Q-enns Sttlastr^a, E. de Fromentel^ Introd. a Vetude des Polyp, 

 foss. p. 223 (1858-61). 



Colony convex, massive. Corallites circular in outline and 

 united by a considerable development of the costse. Calices pro- 

 jecting, circular. Columella round, styliform, and well developed. 

 Septa strongly and regularly dentated. Costse well developed, 

 and pass towards those of the neighbouring calices without being 

 actually confluent. Gemmation between the calices. 



Distribution. — Fossil. Cretaceous : Europe. 



IV. AlHance PHYLLOOCENIOIDA. 



Massive budding Astrseidse. CoralHtes united by their costse, with or 

 without the intervention of exotheca. Columella absent. Endotheca 

 vesicular or tabulate. 



Tribe I. With entire septa. 



Genus Phylloco^nia, Ed. & H. 

 Genus Convexastr^a, d'Orb. 



Tribe II. With dentate septa. 



Genus Adelastr^ea, Reuss= Confusastr^a, Ed. & H. 



Tribe I. 



Genus Phtlloc(ENia, Milne-Edwards Sf Jules Haime, Hist. Nat. 

 des Gorall. vol. ii. p. 272, 1857 {non Lauhe), amended. 



Colony convex, sub spherical, with a large base, or pedunculate, 

 or subplane. Corallites eostulate and united by much exotheca, 

 parallel oi' divergent. Calices circular or deformed, free at the 

 margins, and projecting. Columella absent or rudimentary. 

 Septa large, entire, exsert, and well developed. Costse well 

 developed, prominent, uniting calices . Endotheca abundant and 

 often vesicular. Gemmation occurs between the calices. 



Distribution. — Fossil. Cretaceous : Europe. Eocene : Europe, 

 Sind in Asia. Miocene ; San Domingo. 



The form described by Laube from St. Cassian is not of this 

 genus. This is proved by the magnified view of the section. 

 There is a double wall to the calice, one marginal and the other 

 beyond. Neither is the form a species of CyatJiocoenia^ Duncan. 

 It comes within the Elasmocoenioid alliance (see p. 115). 



