FAMILIES AND GENEEA OE THE MADEEPOEAEIA. 69 



coral. Primary and secondary septa entire and exsert ; those of 

 the higher orders denticulate and not exsert. Well-developed 

 pali in front of the tertiaries. Columella lamellar or papillose, 

 and not much developed. 



Distribution. — Recent. Florida seas and off Havana. 



G-enus Clad an gi a, Milne-Edwards Sf Jules Haime, Hist. Nat. 

 des Cor all. vol. ii. p. 618 (1857). 



The colony arises from a common basal expansion. Corallites 

 Vi^ith septa having lobed margins. Columella parietal. An exo- 

 theca extends from corallite to corallite, giving the appearance of 

 a vertical series of folia. 



Distribution. — Fossil. Miocene : Erance. — Mecent. India {Lilt- 

 Tcen) . 



There are two genera of this subfamily which are exceedingly 

 unsatisfactory owing to the paucity of species and the very in- 

 different specimens. They are Latusastrcea, d'Orb., and Pleuro- 

 ccenia, d'Orb. Milne-Edwards and Jules Haime unite these 

 genera. 



Now LatusastrcBa has a species from the Oolite of ISTattheim, 

 and the specimen figured by Becker and Milaschewitsch, ' Palse- 

 ontographica,' vol. xxi. plate 40. fig. 1, shows sufficient structure 

 to prove that the genus under which it should be arranged is not 

 Pleurocoenia. On the other hand, this last-named genus is not 

 sufficiently defined. 



Genus Lattjsastb^a, d'Orb. Note sur des Polyp, foss. p. 7 

 (1849). (Amended after Becker and Milaschewitsch, ' Palae- 

 ontographica,' vol. xxi. p. 166.) 



Colony in disk-like or crateriform masses, thin and spreading. 

 Base covered with a stout concentrically-folded epitheca. Coral- 

 lites close, inclined in one direction, low. Calices with a pro- 

 jecting lip, otherwise circular. Columella absent. Septa very 

 irregular in size and distribution. A long columellary septum 

 reaching two thirds of the distance from one side of the calice to 

 the other. Costse as delicate striations down the wall. G-emma- 

 tion close to the bases of the corallites from the common basal 

 structure. 



Distribution.— Fossil. Jurassic: Europe. Cretaceous: Europe? 



The genus Fleurocoenia is therefore abolished, and is probably 

 synonymous with the above. 



