SYSTEMATIC 175 



6\, including a small, smooth, papillate protoconch of i\ whorls. Post-nuclear sculpture of narrow, 

 flexuous, protractive, closely spaced axials, commencing just below the slightly concave shoulder, but 

 becoming subobsolete towards the lower suture and on the base of the body-whorl. The axials number 

 from eighteen to twenty-four on the spire-whorls. Sinus subsutural, occupying the shoulder, steeply 

 descending at first and then produced forwards in the arcuate sweep of the outer lip. Aperture narrowly 

 ovate with a rounded, broadly channelled anterior end not constricted and scarcely differentiated. 

 Surface with numerous microscopic spiral lirations, not distinct enough to be counted. 



Height 20-0 mm. ; diameter 7-25 mm. (holotype). 



Height 24-5 mm.; diameter io-o mm. (St. i6o = topotype of purissima). 



Type locality. St. 388. Between Cape Horn and Staten I., 56 19^' S, 67 09! W, 16 Apr. 1930, 

 121 m. 



Typhlodaphne translucida (Watson) 



Pleurotoma (Thesbia) translucida Watson, 1881, p. 444. 



Pleurotoma (Thesbia) translucida Watson, 1886, p. 330, pi. 25, fig. 11. 



Thesbia translucida Thiele, 191 2, p. 248. 



Type locality. Half-way between Marion I. and Prince Edward I., 140 fathoms. 

 St. 1563. Between Marion I. and Prince Edward I., 46 48-4' S, 37 49-2' E, 7 Apr. 1935, 113-99 mm. (one 

 empty shell). 



Typhlodaphne filostriata (Strebel) 



Thesbia filostriata Strebel, 19056, p. 591, pi. 22, figs. 21, 21a. 



Type locality. Borja Bay, 10 fathoms, Strait of Magellan. 

 St. 388. Between Cape Horn and Staten I., 56 19I' S, 67 o 9 f W, 16 Apr. 1930, 121 m. (two empty shells). 



Family ACTEONIDAE 



Genus Acteon Montfort, 18 10 



Type (monotypy): Acteon tornatilis Montfort (= Voluta tornatilis Linn.) 



Acteon bullatus (Gould) 



Tornatella bullata Gould, 1847, p. 251. 



Actaeon bullatus Tryon & Pilsbry, 1893, p. 163, pi. 49, figs. 10, 11. 



Type locality. Off Patagonia. 

 St. WS 71. 6 miles N 6o° E of Cape Pembroke Lt., East Falkland Is., 51° 38' S, 57° 32' 30" W, 23 Feb. 1927, 



82-80 m. 

 St. WS 80. Between Falkland Is. and Patagonia, 50 57' S, 63 37' 30" W, 14 Mar. 1927, 152 m. 

 St. WS 854. Off Patagonia, 45 16' S, 64 25' W, 22 Mar. 1932, 97 m. 

 St. WS 856. Off Patagonia, 46 35' S, 64 11' W, 23 Mar. 1932, 104 m. 



Acteon antarcticus Thiele 



Actaeon antarcticus Thiele, 1912, p. 219, pi. 14, fig. 17. 



Type locality. Gauss Station, 380 m. Davis Sea. 

 St. 170. Off Cape Bowles, Clarence I., 6i° 25' 30" S, 53 46' W, 23 Feb. 1927, 342 m. 

 St. 175. Bransfield Strait, South Shetland Is. 63 17' 20" S, 59° 48' 15" W, 2 Mar. 1927, 200 m. 



17 



