Work found, with species-group names introduced therein:
Gardner, J. 1947. The molluscan fauna of the Alum Bluff Group of Florida. Part VIII. Ctenobranchia (remainder) Aspidobranchia, and Scaphopoda. United States Geological Survey Professional Paper 142H i-ii, 493-656, pls. 52-62. Crucibulum {Dispotaea} waltonense, see Crucibulum waltonense Gardner, 1947