126 



DR. .1. K. GRAY 0\ CORALLIUM JOHNSONI. [Jail. 24, 



Hon icor allium Johnson i. 



CoRALLiuM RUBRUM, Laui., M.-Edw. Corall. i. 204. 

 Madrepora rubra, Linn. 

 Isis nohilis, Pallas. 

 Hob. Mediterranean. 



B.M. 



2. Pleurocorallium. 



" The coral branching in a plane. The polypes scarcely raised, 

 confined to one surface, mostly near the apex of the very small 

 branchlets, and often in twos." The branchlets in the figure are 

 chiefly confined to one edge of the branches. 



Pleurocorallium secundum, Dana, Zoophytes, p. 04 1, t. (JO. 

 f. 1, 1 «. 



Hab. Sandwich Islands?? {Dana). 



3. Hemicorallium. 



The polypes prominent, ovate-cylindrical, often clustered, all dis- 

 tributed on one side of the branches. 



