Astrocoenia incrustans (Duncan) 
PI. , figs. 
1873. Stephanococnia Incrust, ana , Duncan, Quart. Jour. Geol. Soc. 
London, vol. xxix, p. 553, pi. xx, 
fig. 6. 
1899. Stephanocoenia incrustans , Vaughan, Bull. Mus. Comp. Zool., 
vol. xxxiv, p. 229. 
Original description: 
’’The corallum is low in height, and incrusts rocky sur- 
faces . 
The corallites are united by their rather thick walls, and 
are parallel. 
The calicos ar© quadrangular or pentangular, and. their 
margins are marked "by the septa of the adjacent corallites. 
The septa are sub equal at the wall, and 16 in number; but 
only eight reach the small and deep styloid columella; the others 
project very slightly, and are moniliform on their free edge. 
