, s8 DISCOVERY REPORTS 



The small sculptural differences upon which Strebel based his burdwoodianum are covered by the 

 normal range of variation within the species. The burdwoodianum type of sculpture (widely spaced 

 spirals) is mostly found in the deep-water stations, but the fact that both forms occur at the shallow- 

 water (10J-16 m) St. 56 precludes the interpretation of burdwoodianum as a benthic subspecies. 



Dall (19026, p. 535) described an apparently closely related species, T. pelecetus, which is based upon 

 Gould's Fusus crispus var. (1852, p. 229, pi. 16, fig. 2796). 



Dentition. Fig. L, 85, p. 194 (St. 56). Protoconch. Fig. N, in, p. 196. 



Genus Xymenopsis n.g. 

 Type: Fusus liratus Gould 



This genus is provided for a large group of Magellan species which differ from typical Trophon in 

 having a tall, narrowly conic, polygyrate protoconch instead of a paucispiral asymmetrical one, and 

 sculpture in the form of rounded axial varices crossed by spiral cords, but never lamellate processes. 



The style of protoconch is similar to that of the New Zealand genus Zeatrophon and the sculpture to 

 that of Xymene, another New Zealand genus. 



The central tooth of the radula is distinctive in that the base is a simple, broad, shallow, almost 

 straight bar with rounded ends and the cusps, consisting of three tall, slender primaries and two 

 intermediates appear as serrations of a single outgrowth from the basal plate. 



There is a large number of nominal species in this group, but doubtless many of them ultimately will 

 prove to be synonyms. The following names refer to members of the genus Xymenopsis: acuminatus 

 Strebel, 1904; albidus Philippi, 1846; albus and brucei Strebel, 1904; cancellarioides Reeve, 1847 

 ( = liratus Gould) ; cancellinus Philippi, 1845 ; candidate Rochebrune & Mabille, 1889 ; corrugatus Reeve 

 1848; couthouyi Strebel, 1904; decolor Philippi, 1845; dispar Rochebrune & Mabille, 1889; elegans 

 and elongatus Strebel, 1904 ; falklandicus Strebel, 1908 ; fenestrate and hoy lei Strebel, 1904; lebruni 

 Rochebrune & Mabille, 1889; liratus Gould, 1849; loebbeckei Rochebrune & Mabille, 1889; obesus, 

 ornatus, paessleri and paessleri turrita Strebel, 1904; plumbeus Gould, 1852; pseudoelongatus and ringei 

 Strebel, 1904; roseus Hombron & Jacquinot, 1853 (= plumbeus}) ; standeni Strebel, 1904; textiliosus 

 Hombron & Jacquinot, 1854 ( = liratus Gould); and violaceus Rochebrune & Mabille, 1889. 



An evaluation of these names is not possible without recourse to the type material which is in 

 European museums. 



Xymenopsis liratus (Gould) 



Buccinum cancellarioides Reeve, ?i847 (Feb.) (non Buccinum cancellaroides Bast, in Grateloup ' 1840-1846', 



stated by Sherborn to be 1847). 

 Fusus liratus (Couthouy ms.) Gould, 1849, p. 141 (non Fusus lyratus Deshayes, 1843). 

 Fusus textiliosus Hombron & Jacquinot, 1854, pi. 25, figs. 9, 10 (non Deshayes, 1835). 

 Trophon liratus Strebel, 1905 a, p. 238, pi. 8, fig. -j\a-c. 

 Trophon liratus Melvill & Standen, 1907, p. 107. 

 Trophon liratus Strebel, 1908, p. 37. 

 Trophon liratus Melvill & Standen, 1914, p. 120. 



Type locality. Patagonia {liratus). 

 St. 52. Port William, East Falkland Is., 7-4 cables N 17° E of Navy Point, 5 May 1926, 17 m. 

 St. 1230. 67 miles N 62 W from Dungeness Lt., Magellan Strait, 23 Dec. 1933, 27 m. 

 St. WS 784. North of Falkland Is., 49 47' 45" S, 6i° 05' W, 5 Dec. 1931, 170 m. 



It seems probable that Reeve's Buccinum cancellarioides from unknown locality is identical with 

 Gould's Fusus liratus, but I hesitate to upset a well-known name, expecially since the actual date of the 



