TAB. XIX. 

 CORALS FROM THE CORAL RAG. 



COMOSERIS IRRADIANS (p. 101). 



Pig. 1 . Calicular surface of a specimen, in which tlie intercahcular ridges are not very 

 numerous ; natural size. 

 \ a. A specimen, in which the intercahcular ridges are very rare, and the aspect of 

 the compound corallum more resembles that of Asfrea ; natural size. 



lb. A. specimen, in which these ridges are very numerous, and give to the coral 

 the aspect of a Meatidrina. 



1 c. A portion of the specimen. No. 1, magnified, to show the structure of the 

 corallites. 



1 d. Under surface, showing the epitheca covering the common basal plate ; natural 

 size. 



