ACTINOZOA. 



241 



MESOZOIC, CAINOZOIC, and EECENT CORALS, avhich 

 OCCUR IN MORE THAN ONE GEOLOGICAL Peeiod — Continued. 



Choetetes passes up into the Trias. With this 

 exception no genus of Corals survives the Paleozoic 

 epoch except, perhaps, lisis, of which doubtful in- 

 dications have been met with in rocks of very- 

 ancient date. 



No Triassic genus of Corals has recent represen- 

 tatives. Of genera which occur in the Jurassic 

 series seven still survive. Fourteen recent genera 



R 



