Diplothecastraea monitor Duncan* 
PI. fig. 
1867* IDlplocoenia monitor , Duncan, Quart. Jour* Geol* Son. 
London, Vol* XXIV, pp. 21, 25, PI* I, figs. 3 a - 3 c. 
Original description: 
M The corallites are crowded, and either hexagonal or 
pentagonal, and they are rarely four-sided* The inner wall is 
more or less circular, and the coenenchymal space varies in size 
and in the amount of endotheca# The external wall is stout, wavy, 
imperforate, and slightly higher than the internal. The septa 
arise from the inner wall, and very rarely from the outer, or from 
the coenenchymal space . The laminae are linear, straight, wide 
apart, and do not all project to the columella, hut one septum 
often does* Minute septa appear here and there between the 
others, which are subequal* The septal number is variable. In 
a small corallito there are 15 large septa and 3 small; in a 
larger, 13 large and 9 rudimentary septa; in other corallites 19 
