^8 DISCOVERY REPORTS 



Type locality. South-west of Snow Hill I., 64 20' S, 56 38' W, 150 m. 

 St. 182. Schollaert Channel, Palmer Archipelago, 64 21' S, 62 58' W, 14 Mar. 1927, 278-500 m. 

 St. 195. Admiralty Bay, King George I., South Shetland Is., 62° 07' S, 58° 28' 30" W, 391 m. 

 St. 363. 25 miles S 8o° E of south-east point of Zavodovski I., South Sandwich Is., 26 Feb. 1930, 329-278 m. 

 St. 1952. Between Penguin I. and Lion's Rump, King George I., South Shetland Is., 11 Jan. 1937, 367-382 m. 



Height 63-0 mm. ; diameter 22-8 mm. (holotype). 



Height 63-0 mm. ; diameter 22-0 mm. (St. 195). 



Dentition. Fig. M, 91, p. 195. St. 182. 1+0+1+0+1. Central tooth large and broad with a convex 

 upper margin and a single small cusp in the centre. The single series of marginals are composed of 

 large approximately shuttle-shaped teeth, tapered to a single point, and without serrations or denticles. 

 The absence of laterals has enabled a great increase in the size and lateral spread of the central. 



A very similar type of radula is found in Ptychosyrinx bisinnata (Martens) (Thiele, 1931, p. 359) and 

 Leucosyrinx crispulata Martens (Thiele, loc. cit.). 



This species and Fusitriton cancellatum, both of which belong to groups with an extensive western 

 American range, show how the continuity of the western coasts of the Americas has been and still is 

 a supply route to the Antarctic waters of the Weddell Quadrant. 



Aforia goniodes (Watson) 



Pleurotoma clara Martens, 1880, 35, pi. 8, fig. 1 (non PL clara Reeve, 1845). 

 Pleurotoma (Surcula) goniodes Watson, 1881, p. 394. 

 Pleurotoma (Surcula) goniodes Watson, 1886, pi. 20, fig. 4. 

 Leucosyrinx goniodes ( = clara) Martens & Thiele, 1903, p. 90. 



Type localities. Patagonia, 60 fathoms {clara) ; south-east of Rio de la Plata, Argentina, 600 

 fathoms [goniodes). 



St. WS 867. Between Falkland Is. and Grande Bay, Patagonia, 51 10' 8,64° 15-5' W, 30 Mar. 1932, 150-147 m. 

 One empty shell, 37 x 15 mm. 



Genus Leucosyrinx Dall, 1889 



Type (o.d.): Pleurotoma verrilli Dall, North Carolina to Gulf of Mexico. 150-850 fathoms 



I have included the two following species in Leucosyrinx in preference to Aforia because the anal 



sinus is broad, occupying most of the shoulder, and the species lack the strong peripheral carina which 



is so characteristic of Aforia. Unfortunately, none of the specimens contained the animal. Both Aforia 



and Leucosyrinx belong to the subfamily Cochlespirinae. 



Leucosyrinx paratenoceras n.sp., PL IX, fig. 54 



Shell large, elongate fusiform, with a long, slender spire ; lightly convex whorls, except for a concave 

 shoulder; white, covered with a thin, shining, almost colourless, faintly iridescent epidermis and 

 sculptured with closely spaced spiral cords, most of which finally become bifid. Whorls eight, including 

 a smooth papillate protoconch of about two whorls with a small erect central nucleus. Spire tall and 

 narrow, about 1^ times height of aperture plus canal. Post-nuclear sculpture consisting of one or two 

 weak spiral threads near the outer extremity of the otherwise smooth shoulder and seven or eight 

 strong, flat-topped spiral cords between the shoulder angle and the lower suture. About twenty-six 

 cords on the body-whorl plus about ten closely spaced fine threads on the fasciole. Most of the cords 

 on the later whorls are bifurcated by linear grooves. There is no true axial sculpture apart from 

 numerous irregular growth lines. Aperture elongate-oval and produced below into a relatively short 

 and straight spout-like anterior canal. Sinus concave, occupying the whole of the shoulder. Outer lip 



