0, ins ignis - 11- 
Orb ice 11a ins ignis Duncan, 
PI, fig, 
1867, Heliaatraea insignia , Duncan, Quart. Jour, Geol. Soc. 
London, Vol. XXIV, pp, 19, 34, PI, I, fig. 4. 
Original description: 
The corallum is large, and the corallites also; they are 
vd.de apart, are circular in transverse outline, and are very 
equal in size. The wall is stout as regards the septa and costae, 
hut thin in comparison with the diameter of the corallites. The 
septa are delicate, wide apart, long, slightly thicker at the 
wall than elsewhere, straight, and the primary septa are hardly 
any broader than the tertian? - . There are three cycles of septa 
in the six systems, and rarely a septum of the fourth cycle is 
noticed in half of a system# The primary and secondary septa 
are of equal length, and the tertiary extend far in towards the 
The costae are long, slender, 
columella 
The columella is small 
