St. decatursnsia -29- 
Stylophora decaturensis sp. nor, 
PI. figs. 
Corallum small, forming comparatively thick, crispate and 
lob ate fronds. 
Calicos, shallow, irregularly arranged, very small, diameter 
from about .25 to .35 ram., very rarely as much as .5 mm., they 
are cro?/ded on the ends of the lobes, but are distant on the ex- 
panded portion of the frond, as much as 1 mm. The calicular rims 
are not at all or are scarcely perceptibly elevated. Distinct 
costae usually do not extend beyond the margin of the calice. 
Coenenchymal surface very densely and minutely granulate. 
The septa are small, weak, there are six principal ones, and 
the second cycle is usually complete, these Veing very small. 
The upper septal margins are not prominent, but are distinct 
around the edge of the calice* Two opposed septa are stronger 
than the others, so that in weathered calices a longitudinal 
partition remains. Minute dissepiments present. 
