246 



ACTINOZOA. 



Montlwaultia are especially rich in species. 

 Two generic forms represent the Perforata, 

 The families TiivhinolidcG and Oculinidce now 

 appear for the first time. The following: genera 

 are exclusively Jurassic : 



to t.' 



TURBINOI.ID^. 



J)iscoc!/athtcs. 

 Thecocyathus. 



OCULINID^. 



Euhelia. 



ASTR^EED^. 



Axosinilia. 



Haplosmilia. 



Phi/togyra. 



Placosj^kf/Ilia. 

 AngcastrcBa. 



FuNGIDiE. 



Protoscris. 

 Comoscris. 



PORITIDiE, 



Miorosolcna. 

 Anomophijllum. 



II. Cretaceous Corals. — 



The Corals of the Chalk are very numerous, 

 belonging chiefly to the Ajporosa and Perforata. 

 Here also undoubted indications of Alcyonaria 

 present themselves. The Tabulata are repre- 

 sented by two genera. For the last time the 

 order Rugosa makes its appearance, a single 

 genus, Holocystis, being its representative. The 

 families MadreporidWf Pennatulidce (?), and Gor- 

 gonidce (?) now first appear. The following genera 

 are peculiar to this period : 



TURBINOLIDJE. 



Brachycyathus. 

 Cyclocyathus. 

 Stylocyathus. 

 Smilotrochus, 



OCULINID^. 



Synhdia. 

 Baryhelia. 



AsTRjEIDJE. 



Placosmilia. 

 Diploctenium. 

 Parasmilia. 

 Peplosmilia. 



ASTR^IDJE : 



Holocoenia. 



Acanthoccenia. 



Placocoenia. 



Elas7)iocoenia. 



Pcntacaenia. 



Heteroccenia. 



Leptophyllia. 



Dactylosmilia. 



Hymen ophyllia . 



Aspidiscus. 



Stelloria. 



Meandrastrcea. 



