SYSTEMATIC iS9 



conflicting Buccinum cancellaroides Bast, is in doubt. Deshayes's Fusus lyratus does not affect Gould's 

 F. liratus, since the derivations are different. 



I have placed in liratus all the shells with the axials cut by linear spiral grooves. These number about 

 seven on the penultimate. In the numerous allied species the spiral ribs have wider interspaces which 

 are either plain or with an intermediate spiral. Protoconch. Fig. N, no, p. 196. 



The shallow-water shells from the Falkland Islands usually seen in collections as ' liratus ' are brucei 

 Strebel, 1904. Compared with my interpretation of liratus these shells have wider spiral interspaces 

 with intermediates on the last whorl and the aperture is rather square and more capacious. 



Xymenopsis albidus (Philippi) 



Fusus albidus Philippi, 1846, p. 119. 



Trophon albidus Strebel, 1904, p. 222, pi. 7, fig. 6^a-d. 



Type Locality PMagellanic 



St. WS 71. 6 miles N 6o° E of Cape Pembroke Lt., East Falkland Is., 23 Feb. 1927, 82 m. 



St. WS 88. Off Staten I., Tierra del Fuego, 54 S, 65 W to 54° S, 64 55' W, 6 Apr. 1927, 118-118 m. 



St. WS 97. Between Falkland Is. and Patagonia, 49 S, 62 W to 49 01' S, 61° 56' W, 18 Apr. 1927, 146-145 m. 



St. WS 222. South-east of Puerto Deseado, Patagonia, 48 23' S, 65 W, 8 June 1928, 100 m. 



St. WS 243. Off Santa Cruz, Patagonia, 51 06' S, 64 30' W, 17 July 1928, 144-141 m. 



St. WS 750. North-east of Falkland Is., 51 50' S, 57 15' 13" W, 18/19 Jan. 1932, 135-144 m - 



St. WS 805. Between Falkland Is. and Patagonia, from 50 11' S, 63 27' W to 50° 09-5' S, 63 31' W, 6 Jan. 



1932, 150-148 m. 

 St. WS 808. Off Santa Cruz, Patagonia, 49 40' 15" S, 65 42' W, 8 Jan. 1932, 109-107 m. 

 St. WS 829. Between Falkland Is. and Patagonia, 50" 51' S, 63 13' 30" W, 31 Jan. 1932, 155 m. 

 St. WS 834. Off Bahia Grande, Patagonia, 52 57' 45" S, 68° 08' 15" W, 2 Feb. 1932, 27-38 m. 

 St. WS 838. Between Falkland Is. and Patagonia, 53 11' 45" S, 65° W, 5 Feb. 1932, 148 m. 

 St. WS 861. Off Puerto Deseado, Patagonia, 47 40' S, 64 12' W, 27 Mar. 1932, 117-124 m. 

 St. WS 863. Between Falkland Is. and Patagonia, 49 05' S, 64 09' W, 28 Mar. 1932, 121-117 m. 

 St. WS 865. Between Falkland Is. and Patagonia, 50 03' S, 64 14' W, 29 Mar. 1932, 126-128 m. 

 St. WS 867. Between Falkland Is. and Patagonia, 51 10' S, 64 15' W, 29 Mar. 1932, 137-144 m - 

 St. WS 869. Between Falkland Is. and Patagonia, 52 15' 30" S, 64 13' 45" W, 31 Mar. 1932, 187-0 m. 



This shell, which is widely distributed in the deeper waters of the Falklands-Magellan area, is 

 referred to albidus on the basis of Strebel's interpretation (1904). 



Dentition. Fig. M, 90, p. 195 (St. 834). 



Xymenopsis falklandicus Strebel, PI. IX, figs. 46, 47 



Trophon falklandicus Strebel, 1908, p. 39, pi. 1, fig. 8a-c. 

 Trophon falklandicus Melvill & Standen, 1912, p. 354. 



Type locality. Falkland Is., 7-40 m. 

 St. 55. Entrance to Port Stanley, East Falkland Is., 2 cables S 24 E of Navy Point, 16 May 1926, 10-16 m. 

 St. 56. Sparrow Cove, Port William, East Falkland Is., ii cables N 50 E of Sparrow Pomt, 16 May 1926, 

 io|-i6 m. 

 Melvill & Standen (1912) consider this species doubtfully distinct from paessleri Strebel, 1904, from 

 Smyth Channel, Strait of Magellan, but it is much nearer to, if not identical with hoylei Strebel 1904. 

 As previously remarked, Strebel described so many closely similar Trophons of this group from the 

 Magellan Region that it is useless to attempt their evaluation without recourse to the type specimens. 



15 



