Early Pleistocene to Middle Pleistocene; Extinct.
First English Description (from Smith, 1936, p. 22):
"Shell narrow, sutures deeply impressed and with a tendency toward crenulation or puckering caused by the termination of the axial rounded ribs which, in turn, are most prominent upon the spire; about 8 of the undulating ribs upon each of the earlier whorls; body whorl with about 18 spiral somewhat shining ribs, some with a pair of incised lines between, especially above and adjacent to the periphery, the spiral ribs strongly marked inside aperture; canal long and slightly sinuous. Length 50 mm. PI. 9, fig. 16. Clewiston, Florida.
This very elegant shell is totally different from any of the recent or tertiary species. It is an unusually narrow shell; also easily separated on account of the body-whorl contour. Named in honor of Dr. George A. Waterman whose contributions to our knowledge of Maine and Florida mollusks are deeply appreciated."
To access this description in its original formatting through the Biodiversity Heritage Library, click here.