246 



ACTINOZOA. 



Montlivaultia are especially rich in species. 



Two generic 

 The families 



forms represent the Perforata. 

 Turbinolidce and Oculinidce now 



appear for the first time. The following genera 

 are exclusively Jurassic : 



TURBINOLIDJE. 



Discocy athus . 

 Thecocyathus, 



Oculinidce. 



Euhelia. 

 Astrjeid^e. 



Axosmilia. 



Haplosmilia. 



Phytogyra. 



ii. Cretaceous Corals. 



ASTR^EID^E : 



Placosphyllia. 

 AngeastrcBa. 



FUNGIDJE. 



Protoseris. 

 Comoseris. 



PORITIDJE. 



Microsolena. 

 Anomophyllum 



The Corals of the Chalk are very numerous, 

 belonging chiefly to the Aporosa and Perforata. 

 Here also undoubted indications of Alcyonaria 

 present themselves. The Tabulata are repre- 



For the last time the 



sented by two 

 order JRugosa 



genera, 

 makes its 



appearance, a single 



genus, Holocystis, being its representative. The 

 families Madreporidce, Pennatulidce (?), and Gor- 

 gonidce (?) now first appear. The following genera 

 are peculiar to this period : 



Turbinolidce. 

 Br achy cy a thus. 

 Cyclocyathus. 

 Stylocyathus. 

 Smilotrochus. 



OCULINIDJE. 



Synhelia. 

 Baryhelia. 



AsTRcEID^l. 



Placosmilia. 



Diploctenium. 



Parasmilia. 



Peplosmilia. 



ASTRJEID2E : 



Holomnia. 



Acanthoccenia. 



Placocoenia. 



Elasmocxnia. 



Pentacwnia. 



Heteroccenia. 



Leptophyllia. 



JDactylosmilia. 



Hymeiophyllia* 



Aspidcus. 



Stellornisa. 



Meandrastrcea. 



