what shorter and thinner; quart ernaries shorter and thinner than 
the tertiaries; the last cycle extremely thin* The courses 
Olt iu*_ 
of the septa are usually curved or flexuous. iiio perforations. 
h 
.g- ui l d- >n r '-f u — i T- r nr?rU Septal faces with some scattered granu- 
lations. There are no pali, hut below the bottom of the calice 
the inner ends of the principal septa are considerably thickened, 
fusing one to another. A transverse section cut above the 
level of the upper termination of the columella shows no sign of 
pali. The interseptal loculi are open. There are neither 
synapticula nor dissepiments. What Duncan considered synapticula 
are secondary in origin. The surfaces of the septa can usual- 
* 
ly be traced through the interseptal mass es of calcitef . 
Columella a more or less flexed lamella, with some 
sharp processes projecting from the sides. In places it is 
fused to the principal septa. 
The preceding description is based on Duncan's type speci- 
men, and a smaller (younger) specimen, of which a thin section 
