SYSTEMATIC 157 



Subgenus Fuegotrophon n.subg. 



Type: Fusus crispas Gould, 1849 

 This new subgenus is provided for a small group of Magellan Trophons of fusiform shape with 

 turreted spire and long canal, and sculptured with spiral cords crossed by bluntly rounded axials and 

 a dense surface covering of low crisp lamellate ridges. Its distinctive features are a paucispiral, asym- 

 metrical, rather bulbous, smooth protoconch and a dentition that departs somewhat from the stereotyped 

 monotony of most Trophonoid radulae. These differences are exhibited in the central tooth, which 

 has the massive central cusp reinforced by a buttress which extends below the lower margin of the basal 

 plate. The basal plate is broad, shallow and rectangular, but with three basal projections caused by 

 a downward extension of the outer basal extremities, plus the base of the central buttress. The upper 

 and outer extremities of this plate are upwardly produced to form two extra cusps, giving a formula of 

 seven cusps instead of the usual five. The three primary cusps are well developed with the central one 

 largest ; the intermediates are very little less in size than the outer primary cusps and of approximately 

 equal size to the extra cusps on the outer extremities of the basal plate. The transverse ridge representing 

 the upper edge of the central tooth bears groups of several parallel vertical grooves, or incipient denticles, 

 at each outer extremity. 



The operculum is ovate-quadrate with a blunt terminal nucleus situated at the lower right-hand 

 corner. 



Trophon (Fuegotrophon) pallidus (Broderip) 



Murex pallidas Broderip, 1832, p. 194. 



Fusus crispus Gould, 1849, p. 141 (non Fusus crispus Borson, 1821 (1822?)). 



Fusus fimbriates (Gay) Hupe, 1854, p. 165, pi. 4, fig. 7 (non Fusus fimbriates Borson, 1821 (1822?)). 



Fusus fasciculatus Hombron & Jacquinot, 1854, p. no, pi. 25, figs. 15, 16. 



Trophon crispus Tryon, 1880, II, p. 143, pi. 31, figs. 328, 329, pi. 70, fig. 437. 



Trophon crispus Strebel, 1905a, p. 204, pi. 3, fig. 10 a-g. 



Trophon crispus Melvill & Standen, 1907, p. 106. 



Trophon crispus burdwoodianum Strebel, 1908, p. 38, pi. 1, fig. i$a-c. 



Type localities. Falkland Is. (pallidus); Strait of Magellan (crispus, fimbriatus and fasciculatus); 

 Burdwood Bank, 137-150 m. (burdwoodianum). 



St. 51. Off Eddystone Rock, East Falkland I., from 7 miles N 50 E to 7-6 miles N 63 E of Eddystone Rock, 



4 May 1926, 105-115 m. 

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



ioi— 16 m. 

 St. 57. Port William, East Falkland Is., sh cables S 20° W of Sparrow Point, 16 May 1926, 15 m. 

 St. 388. Between Cape Horn and Staten I., 56° 19V S, 67 09!' W, 16 Apr. 1930, 121 m. 

 St. WS 85. 8 miles S 66° E of Lively I., East Falkland Is., 25 Mar. 1927, 79 m. 

 St. WS 88. North of Staten I. from 54 S, 65 W to 54° S, 64 55' W, 6 Apr. 1927, 118-118 m. 

 St. WS 750. Off entrance to Strait of Magellan, 19 Sept. 1931, 95 m. 

 St. WS 824. Off Falkland Is., 52° 29' S, 58° 27' W, 19 Jan. 1932, 146-137 m - 



I have selected pallidus as the earliest name for the well-known but preoccupied crispus since the type 

 locality Falkland Islands and Sowerby's figure seem to indicate this species, but if my interpretation 

 should prove to be incorrect, then fasciculatus Hombron & Jacquinot must be used. Cossmann's 

 substitute name Trophon gouldi (1903, p. 54) was bestowed upon a New Zealand Pliocene fossil, 

 wrongly ascribed to crispus. 



