Astrocoenia duerdeni 
Original description: 
"Form of corallura, a convex mass; type specimen, 28 mm. in 
diameter on the base and 24 mm. high. The specimen is broken off 
from a larger piece, as Fig. 2, Plate XXXVII shows; therefore 
the above measurements do not represent the original siae of the 
corallura. Callces shallow, hexagonal, subequal in size, 1.5 
mm. to 2 mm. in diameter, close together, separated by a simple 
wall which is from a quarter to a half millimeter thick; often 
there are thickenings at the corners of the calicos, and remnants 
of what appear to have been pillars. Septa sixteen, eight 
large, which fuse to the columella, and eight small shorter ones. 
Dissepiments present, apparently numerous, very thin, in places 
may be close together, .5 mm. apart. The columella is styli- 
f orm. 
Locality ♦ District of St. Mary, Parish of St. Mary, .Point 
Haldane ( Institute of Jamaica) ; Port .'.aria (Geological Society 
of London) 
