FAMILIES AND GENEEA OE THE MADEEPOEARIA. Ill 



The following genus is not satisfactory in the face of the 

 possibility of Stylina having dentate septa : — 



G-enus Sttlaste^a, E. de Fromentel, Introd. a V etude des Polyp, 

 foss. p. 223 (1858-61). 



Colony convex, massive. Corallites circular in outline and 

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

 jecting, circular. Columella round, styliform, and vp^ell developed. 

 Septa strongly and regularly dentated. Costse well developed, 

 and pass towards those of the neighbouring calices without being 

 actually confluent. G-emmation between the calices. 



Distribution. — Fossil. Cretaceous : Europe. 



IV. Alliance PHYLLO0(ENIOIDA. 



Massive budding Astrseidae. Corallites united by their costse, with or 

 without the intervention of exotheca. Columella absent. Endotheca 

 vesicular or tabulate. 



Tribe I. With entire septa. 



Genus Phylloccenia, Ed. & H. 

 Genus Convexastr^a, d'Orb. 



Tribe II. With dentate septa. 



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



Tribe I. 



Genus Phtlloc(enia, Milne-JSdwards Sf Jules Haime, Hist. Nat. 

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



Colony convex, subspherical, with a large base, or pediinculate, 

 or subplane. Corallites costulate and united by much exotheca, 

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

 margins, and projecting. Columella absent or rudimentary. 

 Septa large, entire, exsert, and well developed. Costse w-ell 

 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 OyatJiocoenia, Duncan. 

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



