“Proneptunea fenestrata n. sp., Pl. VI, fig. 12
Shell small, fusiform, with a thick yellowish brown epidermis, prominently sculptured with heavy spiral keels and interstitial thin axial lamellae. Whorls five including a relatively large paucispiral erect protoconch of 1 ½ straight-sided whorls inrolled at the tip, leaving an apical depression. Spire slightly taller than height of aperture plus canal. Spire whorls bearing two very prominent keels, the upper- most, which defines a broad, almost flat shoulder, becoming bifid at the commencement of the penultimate whorl. Body-whorl with the addition of a third prominent keel at the top of the aperture and three much weaker spirals on the base. The shoulder, the interspaces and base crossed by regular crisp axial epidermal lamellae, twenty-one on the penultimate and twenty-nine on the body-whorl. Aperture approximately ovate-pyriform, deeply grooved on the inside, corresponding to the external keels. Outer lip deeply scalloped between the keels, but bridged by the lamellae. Anterior canal short, oblique, and spirally twisted, causing a prominent fasciole which is crossed transversely by a concentration of the terminals of the lamellate processes. In some examples the bifid peripheral keel shows the lamellae in the interspace but on the crest of the keels the lamellae are scarcely apparent. Operculum irregularly ovate-quadrate, with a terminal nucleus.
Height 12.0 mm.; diameter 6.6 mm. (holotype, St. 141).
TYPE LOCALITY. St. 141. East Cumberland Bay, 200 yards from shore, under Mt Duse, South Georgia, 29 Dec. 1926, 17-27 m.
St. 140. Stromness Harbour to Larsen Point, South Georgia, from 54° 02' S, 36° 38' W to 54° 11' 30" S, 36° 29' W, 23 Dec. 1926, 122-136 m.
St. 145. Stromness Harbour, between Grass I. and Tonsberg Point, South Georgia, 7 Jan. 1927, 26-35 m.
St. WS 25. Undine Harbour (north), South Georgia, 17 Dec. 1926, 18-27 m.
St. MS 10. East Cumberland Bay, ¼ mile south-east of Hope Point to ¼ mile south of Government Flagstaff, South Georgia, 14 Feb. 1926, 26-18 m.
DENTITION. Fig. K, 67, p. 193 (St. 141). PROTOCONCH and OPERCULUM. Fig. N, 106, 124, p. 196.”
(Powell, 1951: 149)
