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FAMILY VI.— EUPSAiMMIADiE. 
The stony tissue is here deposited in siieh a manner that 
tlie corallum. instead of being compact, is porous, but not 
so open as to have a spongy texture. The wall is thick, 
and constitutes the chief part of the wliole ; it is perforate, 
and eitlier almost or quite naked, with a gi-anulate ver- 
miculate surface. 
The plates are numerous ; those of the last cycle always 
deviate from the radius of the calice, their planes approach- 
ing the bisection of their system, so that the whole septal 
arrangement assumes the form of a six- or twelve-rayed 
star; by which very remarkable peculiarity this family 
may be infallibly recognised. The plates are perforate. 
The interseptal chambers arc completely open to the bottom, 
or divided only by a few incomplete partitions. 
There is only one British genus known, BaJanophylUa. 
