Protethmos c level, 
The most striking external characters of the species are 
the low, equal or subequal costae, and the girdling constr lotions 
and swellings. The pits "between the costae are distinct. 
Septa ("based on three thin and one polished section). 
Specimen No* 3 has about 60 costae and 65 septa. Of the septa 
about 30 extend to the columella, their inner joined around it 
by means of synapticula. These principal septa are rather thick, 
and are solid or very rarely perforate. The intermediate septa 
are shorter, much thinner and are quite abundantly perforate. 
Septal faces granulate. Synapticula abundant. Dissepiments 
apparently absent. 
Columella small, but well developed, cross-section shows 
several flexed axial trabeculae or laths. 
Locality : Island of St. Bartholomew, 'Vest Indies; ?. T. 
Cleve, 1369, Captain A. Molander, 1872, collectors. 
Geologic horizon : 
Type : University of Upsala. 
