0. cavernosa var anguS.ll. 
reach the columella* Within the wall the septa are thin, in 
the thecal ring they are thicker, the costae are thicker than 
the inner portions of the septa. 
Columella large, composed of twisted, interlacing, fused 
inner ends of septa. Its diameter about^L/^) the diameter of the 
calice. 
Locality : Island of Anguilla, West Indies, ?. T. Cleve, 
Collector. 
Ceologic horigon : Upper Oligocene. 
Type : University of Upsala. 
Remarks : Three specimens belonging to the University of 
Upsala collection are typical, although they show some variation. 
Four other specimens show a gradual approach to the form or 
variety of 0. cavernosa in which the costae are strongly alter- 
nating in size - there is a decrease in both the size and promi- 
nence of the calices. These four specimens are figured on pi 
