A. deeaturensis (54 
Aotinacis deeaturensis , sp . ncv. 
PI. , fig* 
Corallum forming large explanate masses, a foot or more 
across and 70 to 75 mm. thick. Perpendicular section shows a 
thinly lamellate structure. 
Calices small, 1.3 to 1.5 mm. in diameter, usually 
separated by less than their own diameter of coenenchyma. The 
coenenchyma is composed of flexures, perforate, granulated costae 
which are fused into a reticulum by abundant synapt icula. The 
calices are distinctly differentiated from the coenenchyma, but a 
definite wall is only poorly developed, where it is present it 
appears to be due to a sons of peripherally disposed synapticula. 
The costae often lead from one calice to the next, directly 
across the coenenchyma thus joining the septa of adjacent calices. 
Septa, slightly less in thickness than the interseptal 
loculi. The usual number is sixteen, arrangement with refer- 
