"S. processa.
Shorter and stouter, .85 by .35; costae, 15, more narrow; margin less flanging; lower tooth, more prominent; grey externally, blue-white within. In area just south of last. Map 1. 5. Rather common, but all dead. 300. Plate 1. figs. 7 8." Maynard and Clapp, 1920d:116)