S. port oricensis 
s:>38 
the cycles. The primaries appear to he free, the other septa 
form groups around the secondaries. Septal margins finely 
headed. Synapticula abundant. 
Columella not greatly developed. Upper surface finely 
papillose • 
Locality: 4 miles west of Lares, Porto Rico, R. T. 
Hill, Collector. 
Geologic h o rizon: Upper Oligocene, Pep in o formation. 
Type : ho. , United States Rational Museum. 
