0* megalaxona 
- 46 ' 
Orb ice 11a megalaxona (Duncan)* 
PI. fig. 
1863. Astraea megalaxona, Duncan, Quart. Jour. Geol. Soc. London 
Vol. XIX, p. 420, PI. XIII, figs. 12 a, 12 b. 
1866. Heliastraea megalaxona , Duchassaing & Michelotti, Sup, 
Corall. Antilles, p, 86 (of reprint), 
1867. Heliastraea megalaxona , Duncan, Quart. Jour, Geol. Soc. 
London, Vol. XXIV, p. 24. 
1870. Heliastraea megalaxona , Duchassaing, Sup. Corall, Antilles 
p . 30 , 
Original description: 
"Corallum large. Corallites very numerous, crowded, very 
variable in breadth, long and slender; they have suffered much 
from mutual pressure, and although the walls are distinct, yet 
the corallites are often more or less polygonal; diameter from 
l/8 to l/5 inch. Walls thin. Costae small. Septa very deli- 
