Stylophora compressa typica. 
PI. , figs. 
Duncan’s original description will precisely apply to this 
variety. The co rallum is ramous, the branches often decidedly 
compressed, plate-like, free to a considerable extent, the sur- 
face is without monticules (several small flattened branches are 
represented by pi. , figs. ). The calices average 
larger than in the varieties subsequently to be described, 
usual diameter, 1 mm. 
Stylophora compressa var. subnodo3a nov. 
PI. , figs. 
This variety is separated from the typical form by having 
the branches reduced in length. The sides of the coral lum may 
have broad longitudinal furrows between more or less compressed 
or rounded ridges, in these cases the branches are fused together 
through a great portion of their length, they terminate, however, 
