Maynard (1913b:183-184) surmised that "Neither this nor the above [S. agasizzi] appear to be ancestors of any living form thus discovered." Maynard (1921b:151) reported 400 specimens and provided citations to illustrations (pl. 47, figs. 3, 4) that were never issued. Gould and Woodruff (1986:480) reported examining the holotype, and provisionally considered this taxon to be a synonym of Cerion agassizi Dall, 1894.