"31. S. exasperata.
More cylindrical, 1.27 by .47; costae, 29 as wide as interspaces, low; margin. .07; pale yellow-brown externally, deep brown within, costae, white. Key east of Anna's Tract, Great Exuma. on northeast point, in a small area, on shrubs. 572. Plate 23. figs. 1, 2." (Maynard and Clapp in Maynard, 1920d:123)