"32. S. crassa.
Larger, 1.37 by .50; costae, few. 12, as wide as one half the interspaces, low, margin, 05; pale yel1ow-brown externally and internaly, marked on interspaces with darker, costae margin and tooth, yellow-white. East Hill, Little Norman's Key at base of shrubbery; not very common. 400. Plate 21, figs. 9, 10." (Maynard and Clapp in Maynard, 1920d:123)