FAMILIES AN-D aENERA OF THE MADREPORARIA. 



149 



cyclolitoid in shape. Calice shallow, subplane, circular in outline. 

 Columella styliform, promineat. The septa are numerous, close, 

 unequal, uniting, bifurcating and trifurcating, exsert, granulate, 

 and serrate. Epitheca strong and well developed. 

 Distribution. — Fossil. Trias : Europe. 



Grenus Placoseris, U. de Fromentel, Fal. Frang., Terr. cret. 

 Zooph. p. 329 (]867). 



Corallum largely fixed, with a cylindrical wall. Calice round 

 and deep. Columella elongate, and composed of a series of 

 trabeculae soldered together and strongly spinulose at the sides. 

 Septa numerous, unequal, and synapticulate. 



Distribution. — Fossil. Cretaceous : Europe. 



In the drawing (pi. 49. fig. 4ia, b) the columella is very 

 small. 



Grenus Elliptoseris, Duncan, Fossil Corals Sfc. of Bind, Fal. Ind, 

 Ser. xiv. p. 48, pi. viii. (1880). 



Corallum simple, pedunculate, conical, compressed, with a 

 widely open elliptical calice. Columella absent. Axial space 

 elongate and deep. Septa numerous, uniting. Pali exist on the 

 united septa. Costse developed. Synapticula are common. 

 Epitheca none. 



Distribution. — Fossil. Eocene : Sind. 



II. Alliance CYCLOSERIOIDA. 



Simple Lophoseridae more or less discoid or plano-convex in shape, with 

 nearly flat basal walls and numerous septa, many of which unite. Pali 

 may occur. Columella variable. Epitheca exists or not. 



Genus Cycloseris, Ed. & H. 

 Genus Diaseris, Ed, & H. 

 Genus Zittelofungia, Duncan. 

 Genus Bathyactis, Moseley. 

 Genus Asteroserts, E. de From. 

 Genus Microseris, E. de From. 



The genus Tricycloseris, Tomes, is too doubtful, and is absorbed. See 

 E. Pratz, ' Palseontographica,' 1882. 



Genus Cycloseris, Milne-Edwards Sf Jules Haime, Hist. Nat. 

 des Corall. vol. iii. p. 49 (1860), pi. D 12. fig. 3. 



Tbe corallum is simple, free, circular, elliptical, or angular in 



