Diplocoenia monitor 
large and 5 small septa, 14 and 4, and 14 and 10 septa 8 
There are no costae* The columella is lamellar and flat, 
hut very distinct, and is often joined to one or mere septa* 
The endotheoa between the walls is inclined and -vesicular, 
and rather abundant, and that within the internal wall and be- 
tween the septa is very sparely developed. 
Diameter of largest corallites b/20 inch, the ecenenchymal 
space being about l/20 inch wide* 
The mineralisation is siliceous*, and. the specimen is in the 
British Museum, among the Antiguan corals. 
This is a very remarkable genus*, for it is, as it were a 
Lithootrot ion of the Pafiaeosoic Coral-fauna without tabulae* 
There is nothing like it known; and the lingering of the old type 
in association with vesicular endotheca and an irregular septal 
arrangement which is certainly not hexameral is very interesting 
and suggestive •** 
