Eoancilla
"The characters of this small shell are given in detail under the heading of the genotype, Eoancilla acutula, described below. The distinguishing generic characters include: The rather high, smooth, evenly tapering spire; the small smooth trochoid protoconch; the smooth flattish, closely appressed band of callus covering the lower seven-tenths of the surface of the penultimate and earlier whorls; the flat, oblique band forming the lower part of the columella, bearing 7 or 8 narrow, small, sharply developed plications; the wide,deep, spiral sulcus paralleling this plicated band above; and the absence of columellar plications above the plicated band.".
Type species by original designation: Eoancilla acutula Stephenson, 1941.
Bandel & Dockery (2012: 107) stated: "A number of species assigned to Neogastropoda from the Cretaceous still need to be better known. The Pseudolividae De Gregorio, 1880, based on Pseudoliva Swainson, 1840, with Recent type species, have an ovate to spindle-like shell that may be smooth, or have spiral sculpture and a conspicuous groove on the basal half of the last whorl. The last whorl comprises more than 60 % of the total shell height. Vermeij (1998) included the Cretaceous genus Sulcobuccinum Orbigny, 1850, in Pseudolividae. It is similar or the same as Ptychosyca Gabb, 1877, type species Ptychosyca inornata Gabb, 1876, from the Ripley Formation, which has a smooth surface and a double groove on the basal part of the body that is divided by a raised median band (Sohl, 1964a: pl. 35, figs 1–6). Ptychoscapha inornata has the spire about one third of the shell height covered by a callus glaze hiding the sutures. Eoancilla acutula Stephenson, 1941, from the Owl Creek Formation (Sohl, 1964a: pl. 36, figs 1–7, 10, as Ancilla) may belong here. Its protoconch consists of a few rounded whorls.".