Astrocoenia duerdeni 
Description of Duncan's Stylocoenia emarclata from the 
island of St • Bartholomew: 
Oorallum small Irregularly rounded above. Height, 30 mm*; 
diameter, 25 mm* 
Calices polygonal, moderately deep; walls than at upper 
edge, below somewhat thicker, about *4 mm. Diameter of calices 
1.4 to 2 ram. Small projecting styles occur frequently, usually 
at the corners of the calices. They are considerably thicker 
than the wall, longitudinally striate, low, rounded above. 
Septa, 16 in number, 8 principal and 8 rudiraentar ies . The 
latter are very narrow. The septal margins are finely but very 
distinctly dentate * Interseptal loculi wide and open. Dissepi- 
ments present, rather thick. 
Columella styliforra, moderately large, prominent, the 
termination a slender pointed style. 
Locality. Island of St. Bartholomew, West Indies, Capt * 
A. Mo lander, Collector 
