0, cellulosa 
- 45 - 
The transverse section of the corallites is generally circular, 
now and then deformed. Septa crowded, linear; the primary are 
the largest, hut often the secondary are nearly as large. The 
primary septa are of nearly the same thickness at the wall and 
throughout. There are six systems of four cycles; in imperfectly 
developed systems the fourth cycle is wanting, hut the persistence 
of this cycle throughout all the systems is very generally decided® 
The fourth and fifth orders are 'very small, and when there are 
only three cycles, the third order is small: the septa are 
generally straight. Columella small and slightly developed. The 
wall appears to he stout. Costae attached to every septum, sub- 
equal, and not very greatly developed. Endotheca vesicular, 
greatly developed. There are often four dissepiments dividing 
each interseptal space. Exotheca cellular and highly developed; 
exothecal cells small, more rectangular and larger than the 
endothecal cells. The reproduction is hy extra- call cular gemma- 
tion; the smallest buds visible have three perfect cycles of 
septa 
