: 3 6 DISCOVERY REPORTS 



body-whorl, and in addition there is an interstitial surface sculpture of dense microscopic axial threads. 



Aperture as in the other species except for a peripheral angulation of the outer lip. 



The epidermis is so thin and transparent that it is scarcely apparent. Operculum ovate, paucispiral, 

 occupying slightly more than half the area of the aperture. 



Height 6-o mm.; diameter 4-0 mm. (holotype). 



Type locality. St. WS 766. Between Falkland Is. and Argentina, 45 13' S, 59 56' 30" W, 18 Oct. 



193 1 . 545 m - 



Tromina bella n.sp., PI. VI, fig. 16 



Shell small, ovate, squat, with broadly rounded whorls, evenly sculptured with moderately strong 

 rounded spiral cords and covered with a thin, pale buff epidermis. Whorls 4I, including a blunt, dome- 

 shaped protoconch of 1 i whorls, the tip smooth, followed by a whorl of weak axial threads, becoming 

 more distinct over the last half-whorl which has the addition of weak spiral threads. First and second 

 post-nuclear whorls with seven rounded spiral cords, penultimate with eight and body-whorl with about 

 thirty, ten of which are on the neck. The whole surface is crowded with dense axial threads which 

 render weakly gemmulate some of the spiral cords of the shoulder. Aperture ovate-pyriform with 

 a short open canal. Outer lip thin, columella straight medially and spirally flexed below. Parietal 

 callus weak, shining white with the spiral sculpture showing through towards the outer edge. Operculum 

 ovate, paucispiral, occupying about half the area of the aperture. 



Height 7-4 mm. ; diameter 5-0 mm. (holotype, St. 817). 



Type locality. St. WS 817. Between Falkland Is. and Patagonia, 52 28' S, 64 19' W, 14 Jan. 



1932, 191-202 m. 



St. WS 212. North of Falkland Is., 49 22' S, 6o° 10' W, 30 May 1928, 242-249 m. 



St. WS 244. West of Falkland Is., 52 S, 62 40' W, 18 July 1928, 253-247 m. 



St. WS 816. Between Falkland Is. and Patagonia, 52° 09' 45" S, 64 56' W, 14 Jan. 1932, 150 m. 



St. WS 818. Between Falkland Is. and Patagonia, 52 31' 15" S, 63 25' W, 17 Jan. 1932, 272-278 m. 



Dentition. Fig. L, 72, p. 194 (St. WS 818). Protoconch. Fig. N, 104, p. 196. 



Tromina simplex n.sp., PI. VI, fig. 115 



Shell small, ovate, squat with lightly convex whorls sculptured with dense spiral threads. Whorls 4J, 

 including a blunt dome-shaped protoconch of i| 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, 6o° 05' W, 7 July 1928, 150-256 m. 

 St. WS 216. North of the Falkland Is., 47 37' S, 6o° 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. 



