original description
Dall, W. H. (1890-1903). Contributions to the Tertiary fauna of Florida with especial reference to the Miocene silex-beds of Tampa and the Pliocene beds of the Caloosahatchie River. <em>Transactions of the Wagner Free Institute of Science.</em> 3(1): 1-200 [1890]; 3(2): 201-474 [1892]; 3(3): 475-570, and plates for part 1: pp. 179-190, pl. 1-12; plates for part 2: pp. 449-458, pl. 13-22 [1895]; 3(4): [i]-viii, 571-948, pl. 23-35; [1898]; 3(5): 949-1218, pl. 36-47 [1900]; 3(6): [i]-xiv, 1219-1654, pl. 48-60 [27 October1903]., available online at http://www.biodiversitylibrary.org/item/98240
page(s): 9-10, pl. 1, figs 4-4b [details]
From editor or global species database
Type locality Dall gave localities for both the species Helix crusta and the variety H. crusta var. cunctator, but it is uncertain if both are found at all localities: "Ballast Point silex-beds; also the same formation on the shores of Old Tampa Bay, an arm of Tampa Bay proper, westward from Hillsborough Bay", Florida, United States [details]