FAMILIES AND GENEEA OF THE MADEEPOBAETA. 



118 



exotheca. Calices slightly projecting, circular, united by costse. 

 Columella absent. Septa unequal, but not numerous. Endo- 

 thecal dissepiments stretching across the internal cavities of the 

 corallites like tabulse. 



Distribution. — Fossil. Oolite : England, Europe. Cretaceous : 

 Europe. 



G-enus Aeeacis, Milne-Edwards Sf Jules Haime, Comptes Bend, 

 de V Acad, des Sci. t. xxix. p. 70 (1849). 



Colony massive and Astrseiform. Calices circular or deformed, 

 separated by coenenchyma. Coenenchyma spongy and echinulate 

 on the surface. Walls of corallites distinct from the surrounding 

 coenenchyma. Septa unequal, entire, principal uniting in the 

 axis. No columella. Endotheca rudimentary, or as well- 

 developed horizontal tabuliform processes. 



Distribution. — Fossil. Eocene : Europe, Borneo. 



G-enus Psammophoea, F. de Fromentel, Fal, Fran^., Zooph, Terr, 

 cret. p. 494 (1879). 



This genus was created for Stylophorinse with a papillary 

 columella, before such a thing was found. M. de Fromentel 

 subsequently found a coral in the d'Orbigny museum which 

 presented the characters of the Stylophorinse and also a papillary 

 columella. 



The figures given (pi. 90. fig. 4) show a wretched specimen. 

 However it has a compressed, thin, laminate form with calices 

 on both sides. There are four cycles of septa and fine costse. 

 Calices wide apart. 



It is not one of the Stylophorinae, and I place it here with 

 some doubt. 

 Distribution, — FossiL Cretaceous : Europe. 



VI. Alliance PENTACCENIOIDA. 



Agglomerate Astrseidse, increasing by gemmation. CoraUites united 

 by the costse, more or less free above. Primary septa five in number. 



Genus Pentaccenia, d'Orb. 

 Genus Acanthoccenia, d'Orb. 



G-enus Pentac(enia, d' Orbigny, Bev. et Mag. de Zool. 

 p. 175 (1850). 



Calices with their margins either subcircular and free, or poly- 



LINN. JOTJEN. — ZOOLO&Y, VOL. XVIII. 8 



