“Tromina simplex n.sp., Pl. VI, fig. 15
Shell small, ovate, squat with lightly convex whorls sculptured with dense spiral threads. Whorls 4 ½, including a blunt dome-shaped protoconch of 1 ½ whorls, smooth at first but sculptured with closely spaced axial and spiral threads over the last half-whorl. First and second post-nuclear whorls With ten spiral threads, penultimate with sixteen and body-whorl plus neck with about fifty. Surface crowded with very weak axial growth lines. Aperture ovate-pyriform with a short open canal. Outer lip thin. Columella straight medially and spirally flexed below. Parietal callus smooth, sharply marked off from the sculptured body-whorl.
Height 7.25 mm.; diameter 4.25 mm. (holotype, St. WS 237).
TYPE LOCALITY. St. WS 237, north of the Falkland Is., 46° S, 60° 05' W, 7 July 1928, 150-256 m.
St. WS 216. North of the Falkland Is., 47° 37' S, 60° 50' W, 1 June 1928, 219-133 m.
The species is easily distinguished from bella by its much less inflated sagging whorls and much finer and denser spiral sculpture. No living examples were obtained, but the style of apex renders reference to Tromina almost certain.”
(Powell, 1951: 136)
