Stylophora silleensie sp* nov. 
PI. figs. 
Gorallum ramose, forming rather small clusters with branches 
of two kinds, first, very much attenuated, preserving nearly the 
same diameter throughout a considerab le length, then gradually 
tapering to a rounded end, others are shorter and thicker and 
have bluntly rounded or compressed terminal ions. The long slender 
branches are usually almost terete, but some are compressed, this 
is especially true where new branches are formed by trifurcation 
of the old. PI. , figs. , represent, the different 
forms of the branches and also gives a correct idea of their 
size. 
Calicos shallow, on the long branches arranged along rather 
definite lines parallel with the axis of the branch or along 
slightly twisted spirals, sometimes the arrangement is irregular. 
In outline they are circular or slightly elliptical. Usual 
diameter, 1 mm 
The calicular rim is slightly elevated, with a 
