0. eras so lame Hat a -23< 
When there are more orders in the system than five, that 
is, when there are six, seven, eight, and nine, the tertiary septa 
equal the primary and secondary, the 'blunt end terminating in 
the linear portion a little nearer the wall. When there are four 
cycles, the tertiary septa are smaller than the primary and second" 
ary; and when there are only three cycles, as in young corallites, 
the tertiary septa are linear throughout. The quaternary septa 
are linear and very slightly developed; when there are more septa 
than those of the fourth cycle, the quaternary resemble small 
tertiary septa. The remaining septa are very small and linear, 
and reach a very little way from the wall; they are apt to curve 
towards the septa nearest them. In examining the shape of the 
septa in this and in all the allied forms, particular attention 
must be paid that the section is quite transverse, as any obliquity 
will more or less alter the shape of the larger end. 
As regards the endotheca, the dissepiments are frequent 
and delicate, and not very much developed. The exotheca is 
tolerably well developed, but not in proportion to the sise of the 
