5 6 DISCOVERY REPORTS 



' Homalogyra atomns burdwoodianus Strebel, 1908' (T). 



Pellilitorina pellita (Martens, 1885); Melvill & Standen, 1912. 



* Ataxoccrithium pulhim (Philippi, 1845); Melvill & Standen, 1912. 



'Bittium' burdwoodianum Melvill & Standen, 1912 (T.). 



Cerithiopsis macroura Melvill & Standen, 1912 (T.). 



Colpospirella algida (Melvill & Standen, 191 2) (T.). 



Mathilda rhigomaches Melvill & Standen, 191 2 (T.). 



Balds antarctica (Strebel, 1908); Melvill & Standen, 1912. 



'Turbonilla' smithi Strebel, 1905; Melvill & Standen, 1912. 



' 77 xenophyes Melvill & Standen, 1912 (T.). 



' Trichotropis bruceana Melvill & Standen, 1916' n.nom. for T. antarctica Melvill & Standen, 1912, non Thiele, 



1912 (T.). 

 Tectonatica impervia (Philippi, 1845); Melvill & Standen, 1912. 



*Trochita trochiformis (Gmelin, 1791); probably covers ' Calyptraea chinensis' of Melvill & Standen, 191 2. 

 *T. clypeolum Reeve, 1859. 



Cirsotrema magellanica (Philippi, 1845); Melvill & Standen, 1912. 

 Trophon philip planus Dunker, 1878; Melvill & Standen, 1912. 



T. (Fuegotrophon) pallidas (Broderip, 1832); Strebel, 1908 as crispus burdwoodianum (T.). 

 Xymenopsls falklandicus Strebel, 1908; Melvill & Standen, 1912. 

 Antistreptus magellanicus Dall, 1902; Melvill & Standen 1912. 

 *Pareuthria ringei (Strebel, 1905). 



P. rosea (Hombron & Jacquinot, 1854); Melvill & Standen, 191 2. 

 Savatieria concinna Melvill & Standen, 191 2. 



Paradrnete jragillima (Watson, 1882); Melvill & Standen, 191 2 as typica Strebel, 1908. 

 ' Mitra (Volutomitra) porcellana Melvill & Standen, 1912'; probably a Marginella. 

 *Leucosyrinx paragenota n.sp. 



' Bela anderssoni Strebel, 1908'; Melvill & Standen, 191 2. 

 ' B. fulvicans Strebel, 1908'; Melvill & Standen, 19 12. 

 Toledonia limnaeaeformis (Smith, 1879); Melvill & Standen, 191 2. 

 ' Retusa truncatula (Bruguiere)' Melvill & Standen, 1912; probably not this European species. 



CEPHALOPODA 



Octopus brucei Hoyle, 191 2 (T.). 

 Benthoctopus sp. Robson, 1930. 



SOUTH GEORGIA AND SHAG ROCKS 



This very distinctive biogeographic unit lies from 12 to 20 east of the Burdwood Bank and is part of 

 the Scotia Arc, although it is surrounded by deep water, 3000 m. As pointed out by Earland (1933, 

 p. 29), South Georgia is located in only slightly higher latitudes (54-55° S.) than the Falklands 

 (5i°-52° 30' S), yet the contrast in both their physical conditions and their respective faunas is 

 profound. 



The Falklands are situated on the Patagonian Shelf, not the Scotia Arc, and the surrounding waters 

 are ice-free, being out of the influence of the cold West Wind Drift. South Georgia, on the other hand, 

 is an isolated area in a region of deep water, entirely within the influence of the cold West Wind Drift 

 and even land conditions are glacial. Partially resolving upon these conditions the bottom sediments 

 are mainly tenacious blue muds in contrast to the sandy deposits of the Falkland area and the coarse 

 sandy and often volcanic debris of the South Sandwich — South Shetland section of the Scotia Arc. 

 Owing to the far southward extension of the South American land mass the Antarctic Convergence is 

 forced below its average latitude, with the result that the Falklands lie in the Subantarctic and South 

 Georgia, since it is well to the eastward, comes within the Antarctic zone of surface waters. 



