TAMILIES AISTD GENERA OF THE MADREPORARIA. 147 



old ones in consequence of tlie necessity of founding the family 

 Plesioporitidse. 



There are two Subfamilies — the Lophoseridce simpUces and 

 LopJioseridce aggregates. 



1. Subfamily Lophoseridce simpUces. 

 I. Alliance TROCHOSERIOIDA. 



Lophoseridse with simple coralla, trochoid, turbinate, conico-cylindrical, 

 or subturbinate. Oalices shallow, rarely deep. Septa very numerous, 

 some uniting, close, imperforate, and united by synapticula. Columella 

 variable or absent. Pali may exist. Epitheca may or may not exist. 



Genus Trochosehis, Ed. & H. 

 Genus Gyroseris, Reuss. 

 Genus Turbinoseris, Duncan. 



Subgenus Pal^oseris, Duncan. 

 Genus Phragmatoseris, Milaschewitsch. 

 Genus Omphalophyllia, Laube. 

 Genus Placoseris, E. de From. 

 Genus Elliptoseris, Duncan. 



G-enus Trochoseris, Milne-Edwards Sf Jules Haime, Hist. Nat. . 

 des Corall. vol. iii. p. 57 (1860), date of description in 

 Compt. Bend. t. xxix. (1849). 



Corallum simple, trochoid or cylindroid, adherent ; wall naked, 

 and with delicate costal striations. Calices circular, or lobed at 

 the margin, and irregular, shallow. Columella papillary. Septa 

 very numerous, strongly granulated laterally, uniting. Synap- 

 ticula numerous. 



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

 Asia. — Recent. Philippines. 



Genus G-troseris, Beuss \ Milne-Edwards Sf Jules Haime, Hist. 

 Nat. des Corall. vol. iii. p. 54 (1860). 



Corallum simple, free, pedunculate, trochoid. Calice shallow, 

 with thick margins, circular. Costal fossette large. Columella 

 large and papiliary. Septa not exsert. Wall imperforate. 

 Synapticula exist. 



Distribution. — Fossil. Cretaceous : Europe. 



The morphology of the septa separates the following genus from 

 Leptophyllia and its allies, which belong to the PlesioporitidsB. 



10* 



