FAMILIES AND OENERA OE THE MADREPORARTA. 



73 



Corallites cylindrical, close, long, flexuous, and coalescent in 

 places, free elsewhere. Calices circular. Columella well deve- 

 loped, stjliform and projecting. Septa entire, few, slightly exsert, 

 joining the columella by means of horizontal spiniform projec- 

 tions. Epitheca present or not. Endotheca simple and scarce. 

 Distribution. — Fossil. Oolite, Cretaceous : Europe. 



G-enus Sttlocora, Heuss, Zittel, Palceontol. p. 256. 



Colony subdendroid. Corallites cylindrical, short, free at the 

 sides. Calices circular. Columella styliform. Septa denti- 

 culate, unequal ; tbe primaries tbe largest, exsert and granulate 

 laterally. The inner ends of the larger septa witb a paliform 

 lobe in contact with the columella. 



Distribution. — Fossil. Cretaceous and Miocene : Europe. 



It is a misfortune that M. de Eromentel should have chosen 

 the name Sttlocora for a genus with a papillary columella. I 

 have not been able to find Stylocora, E^euss, and do not there- 

 fore know the date of its diagnosis and publication. 



Genus Stylocora, F. de Fromentel, Fal. Frang., Terr. cret. 

 p. 430 (1872). 



Colony dendroid, with slender branches, free to a great extent. 

 Calice circular. Columella well develoj)ed and papillary. Pali 

 absent. CostsD well pronounced. Septa dentate, well developed 

 and close. 



Distribution. — Fossil. Cretaceous : Europe. 



Genus Placophtllia, d^Orbigny, Note sur les Folyp.foss. 

 p. 8 (1849). 



Colony fasciculate or astrseiform, increasing by sub-basilar 

 or lateral gemmation. Corallites nearly entirely enveloped in a 

 strong folded epitheca, and often united together without the 

 presence of costse or exotheca. The columella is strong and 

 styliform. Septa well developed. Endotheca abundant. 



Distribution. — Fossil. Oolite : Europe. 



The next genus is a very doubtful one, the specimens being in 

 a very miserable condition, and I place it here provisionally. 



Genus Donacosmilia, F, de Fromentel, Introd. d V etude des 



Folyp.foss. p. 146 (1858-61). 

 Colony fasciculate, reaching to a considerable height. Wall 



