150 PEOF, P. MAETIN DUNCAN' S EEVISION OP THE 



outline, more or less horizontal or concave below, flat, nummi- 

 form, convex, semihemisplierical above. "Wall flat, costulate, 

 imperforate. Central fossette narrow elongate or circular. Co- 

 lumella rudimentary or papillary, and slightly developed. Septa 

 very numerous, uniting, denticulate at the free edge, exceed- 

 ingly granular at the sides, imperforate. Synapticula abundant, 

 and variable in their length. 



Distribution. — Fossil. Cretaceous : Europe. Eocene : Europe ; 

 Sind, Asia. Miocene : Sind, Asia. — Recent. Eed Sea, Chinese 

 seas. Pacific. — Suhfossil. Eed Sea. 



The genus Trieycloseris, Tomes (Quart. Journ. Geol. Soc), 

 places itself in the proximity of Gycloseris, as the name indicates. 

 E. Pratz remarks (Palaeontographiea, xxix. p. 108) that the soli- 

 tary specimen of the genus may be an abnormal form, and brings 

 before our notice that occasionally simple forms have exception- 

 ally developed more than one calicular centre, as may be observed 

 in Montlivaltia and Omphalophyllia. 



Genus Diasebis, Milne-Edioards Sf Jules Haime, Hist. Nat. des 

 Corall. vol. iii. p. 54 (1860), pi. D 12. fig. 4. 



Syn. Ecmesus, Phil. ; Semicyathus, Seguenza. 



Corallum simple, free, discoid, low. "Wall naked and costu- 

 late, imperforate ; margin lobed, irregular. In the young state 

 composed of separate pieces or lobes which unite irregularly 

 during growth. Septa irregular, uniting, numerous, serrate or 

 dentate. Synapticula exist. Columella rudimentary or absent. 



Distribution.— Fossil. Miocene, Pliocene : Europe. — Mecent. 

 Elorida, Barbadoes, Worth Atlantic, Pacific, Australia. 



Many species of Cyclolites were described by me in the " Eossil 

 Corals and Alcyonaria of Sind," ' Palseontologia Indica,' Series xiv. 

 (1880), pp. 52-55. E. Pratz considers that the forms should pass 

 into another genus, and presumably because the septa are imper- 

 forate and there is no endotheca. Certainly now that it is clear 

 that the typical Cyclolites had perforate septa and dissepiments, 

 the species from the Eocene of Sind differ generically from it. I 

 have founded the genus Zittelofungia to meet the want caused 

 by the necessary removal of Cyclolites into the Plesioporitidse, 



Genus Zitteloeungua, Duncan. 



Syn. Cyclolites, Lmk. 



Corallum free, piano-convex, circular or elliptical in outline. 



