0. antillarum -3- 
Buncan in Quart. Jour. Geol. Society of London, Vol. XX, 
p. 36, PI. IV, fig. 2, lists a coral as Astraea antillarum var., 
and makes the following note: 
"With more distinct oalices than the type, produced costae, 
and a less perfect development of the third septal cycle. The 
exact locality is not known, "but the Coral, from its mineralogical 
characters, appears to have "been obtained from Antigua. Brit. 
Mus. ” 
Remarks : By comparing the description of 0. ant ilia rum with that 
°f 0. cavernos a it will be seen that the two are similar, except the 
former has only three cycles of septa. As there is in the latter con- 
siderable variation in the development of the fourth cycle of septa, and 
as they are often very small and may be destroyed, something especially 
likely to occur in worn specimens, such as fossils usually are, it seems 
probable that 0_. antillarum should be placed in th© synonymy. of _0. cav- 
