0 . cr&sso lame 1 lat a 
- 18 - 
820 I 
equal to them In size* In examining these forms allowance iuust 
he made for their fossil condition; and attention must he given, 
in examining transverse sections of coral litea, that they are 
quite at right angles to the corallite, for any obliquity will, 
of course, diminish the peculiar spear- shape or mace -shape of the 
septa, and render them more litre a paddle, or a leaf with the 
stalk attached. 
The tendency of the higher orders of septa to become linear 
throughout, or to be less decidedly large at one end and thin 
elsewhere -- that is, more or less uniformly thick, but in a less 
degree than is usual at time wall, — is seen throughout the 
species; and in a gigantic variety, where the fully developed 
corallites have twelve or fourteen septa in every system, the 
whole of the septa are less decidedly thick at the wall, and are 
either more or less so throughout, or present the usual form of 
the septa in a modified degree. 
This species is found throughout the great Marl-formation, 
