SYSTEMATIC 91 



St. WS 239. North-west of Falkland Is., 51 10' S, 62° 10' W, 15 July 1928, 196-192 m. 



St. WS 784. North of Falkland Is., 49° 47' 45" S, 6i° 05' W, 5 Dec. 1931, 170-164 m. 



St. WS 804. North-west of Falkland Is., 50 22' 45" S, 62 49' W, 6 Jan. 1932, 143-150 m. 



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



St. WS 829. North-west of Falkland Is., 50 51' S, 63 13' 30" W, 31 Jan. 1932, 155-0 m. 



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



Range. From 45 16' to 52 9' S and 58 27' to 64 25' W. in 15-256 m., Falklands area to Golfo 

 de San Jorge, Patagonia. 



In addition to the above, Strebel (1908) described a third species, venustidam, from Port Albemarle, 

 Falkland Islands, at 40 m. 



All three are closely allied and may yet prove to be variations of a single species. 



The Discovery material is covered by both modestulum and falklandicum, but no examples of the 

 stronger sculptured venustuhim were taken. The chief differences between modestulum and falklandicum 

 are that the former has a rounded periphery and only subobsolete spirals on the base, whereas the latter 

 is carinated by a peripheral ridge and has several distinct spirals on the inner part of the base, bordering 

 the pillar. The third member of the group, venustuhim, resembles falklandicum, but has granulated 

 spirals on the upper portion of each whorl. 



Taking the station lists for both modestulum and falklandicum, only two stations, WS 80 and WS 225, 

 produced both species, but on the other hand only one or two examples were taken at most of the 

 stations. 



The two forms do not indicate obvious bathymetric variation except that modestulum alone is 

 represented at the deepest station, 350 m. The range is similar also, except that on the available records 

 falklandicum extends farther northwards and modestulum farther westwards than the centre of dis- 

 tribution, which appears to be just north of the Falklands. 



Calliostoma sp. 



Specimens from three Magellanic stations have the shape of falklandicum but have three broad spiral 

 bands of pink on the spire whorls. The carina bears a smooth raised spiral ridge, and there are two 

 subsidiary spiral cords on the upper surface of the whorls. They closely resemble Strebel's (1905) 

 figure of C. nuda roseotincta and C. optimum Rochebrune & Mabille (1889). Compare also nuda 

 Philippi, nuda flavidocarnea, irisans and kophameli Strebel, dozei Rochebrune & Mabille and consimilis 

 Smith. 



I am unable to determine satisfactorily the undermentioned material since it does not include adults 

 and there are a number of Magellan species, all very similar as far as one can judge from descriptions 

 and figures. 



St. 1321. From 4 miles S 72 W of East Tussac Rock, Cockburn Channel, to 5-6 miles S 75 W of Tussac Rock, 



Tierra del Fuego, 16 Mar. 1934, 66 m. 

 St. WS 222. South-east of Point Desire, Patagonia, 48 23' S, 65 W, 8 June 1928, 100-106 m. 

 St. WS 243. Between Falkland Is. and Patagonia, 51 06' S, 64 30' W, 17 July 1928, 144-141 m. 



Calliostoma coppingeri (Smith) 



Trochus (Zizyphinus) coppingeri Smith, 1880, p. 320. 

 Calliostoma coppingeri Dall, 1889 a, p. 344, pi. 12, fig. 4. 



Type locality. Mouth of Rio de la Plata, 28 fathoms, Argentina. 



St. WS 852. 44 12-5' S, 64 13' W, 21 Mar. 1932, 86-88 m. 



Dentition. Fig. H, 18, p. 190. 



Range. Off Rio de la Plata, 10 fathoms, and off Cape Delgado, 43 fathoms (Dall, 1889). 



