FAMILIES AND GENERA OP THE MADREPORAEIA. 



93 



Genus Dimorphophtllia, Beuss^ " Foss. Foram., Anthozoen von 

 Oherhurg in Steiermaric'' Denies, d. Kais. Akad. der Wiss. 

 Wien, Bd. xxiii. p. 16, altered. 



Colony low, narrowly pedunculate, thin, with an undulating 

 margin. A central calice, with numerous septa which are con- 

 fluent with those of other calices in eccentric circles ; short or 

 long, straight or curved ridge-shaped elevations pass from the 

 margin of the colony, and are marked with costse. The ridges 

 enclose yalleys with the eccentric calices, which do not appear 

 to have columellse. CostsD distinct. 



Distribution. — Fossil. Jurassic, Eocene : Europe. 



Genus STiBASTRiEA, Ftallon., Ftudes Fal. sur le Haut Jura., 1858 ; 

 F. de Fromentel, Introd. a V etude des Folyp. foss. p. 164. 



Colony expanded, pedunculate. Calices disposed in series, 

 more or less regular and long, around a central calice, directed 

 to the circumference of the corallum. Series tolerably distant 

 and united by their costse. Septa thick and dentated. Columella 

 papillary. Epitheca strong and folded. 



Distribution. — Fossil. Jurassic : Europe. 



Genus Latiphtllia, F. de From. Introd. a V etude des Folyp.foss, 

 p. 164 (1858-61). 



Colony large, pedunculate, increasing fissiparously. Calices 

 large, in series radiating from a central calice to the edge of the 

 corallum, separate, and covered with epitheca. Columella absent. 

 Septa large and distant. Costse exist. Endotheca abundant. 



Distribution. — Fossil. Jurassic : Europe. 



Genus MTCETOPnTLLiA, Milne-Fdwards Sf Jules Saime, Hist. 

 Nat. des Corall. vol. ii. p. 375 (1857). 

 The colony is massive and fixed. The corallites are united by 

 their very thin walls. The calices are in series in valleys, which 

 are shallow and more or less sinuous, the interseptal loculi being 

 almost superficial ; the caliciual centres are especially indicated 

 by the direction of the septa, which are not numerous, barely 

 exsert, wide apart, and strongly and unequally dentated. Colu- 

 mella rudimentary or absent. Endotheca vesicular and very 

 abundant. Common plateau lobed, spinulose, and has a rudi- 

 mentary epitheca. 



Distrihution. — Fossil. Cretaceous : Europe. Eocene : Europe. 

 Miocene : Europe. — Becent. Eastern seas. 



