0. crassolamellata -31- 
Orb ice 11 a erassolamellata var. nugenti. 
PI. XIII, fig. 5. 
% 
"The specimen upon which this variety is founded has no 
calices, but the transverse views of the corallites are very 
distinct • 
Corallites l/3 inch in diameter, not crowded® Septa in six 
systems, two cycles in four systems and three in the other two. 
The tertiary orders are small, and often join the secondary near 
the columella* The primary septa are square and large at the 
wall, and not very linear, but staff-shaped within; their width 
at the margin is l/l5 inch. The secondary septa are very much 
smaller and thinner than the primary, but nearly as large when 
the tertiary orders are present. Costae wide apart. Exothecal 
cells scalariform, wider than high; from X/30 to l/60 inch high, 
and l/l5 inch long. Endotheca abundant. 
This form has squarer-headed septa, longer exothecal cells, 
costae wider apart, and a lower septal number than many of the 
