DISTRIBUTION OF SOUTHERN HIGH-LATITUDE MOLLUSCA 71 



(9) Probucciniim. South Georgia to Ross Sea, Kerguelen Island and Macquarie Island. North-west 

 Patagonia? 



(10) Cavineptunea n.g. South Georgia and Shag Rocks. 



(11) Prosipho. Graham Land to Ross Sea ; South Georgia to Kerguelen Island and Macquarie Island. 



(12) Anomacme. Magellan. 



(13) Meteuthria. Magellan to Heard and Kerguelen Islands. 



(14) Proneptunea. Kerguelen Island, South Georgia and Shag Rocks. 



(15) Chlanidotella. South Georgia. 



Family Muricidae 



The family is represented by numerous Trophons, the West American genus Acanthina in the 

 Magellan Province and the Falkland Typhina belcheri, probably of warm-water African origin. Typical 

 Trophon ranges from the Magellan Province over the whole circumference of the Antarctic Continental 

 Shelf via the Scotia Arc, as well as to Kerguelen and Macquarie Islands. The new genus Xymenopsis 

 and the new subgenera Fiiegotropfwn and Stramonitrophon are restricted to the Magellan Province. 



The Trophons are of world-wide distribution, but the southern typical members are most like northern 

 Boreotrophon, again suggesting West American continuity, since the North Pacific is the stronghold of 

 the latter genus. 



Family Volutidae 



The large heavy Volutes, Adelomelon, are South American and Magellanic. The Magellanic Tertiary- 

 to-Recent Miomelon and the New Zealand Tertiary-to-Recent Pachymelon-Palomelon evidently had 

 a common ancestry, yet no volutes of this style are known from intermediate areas. 



The other high-latitude southern volutes belong to several specialized genera : 



(1) Harpovoluta: A small thin-shelled Volute resembling the Buccinid Volutharpa. Distribution: 

 South Shetlands, Davis Sea and Macquarie Island (Tomlin, 1948). 



(2) Provocator : A small, elongated, thin-shelled Volute from Kerguelen Island and between Falkland 

 Islands and Patagonia. 



(3) Guivillea: A large, thin-shelled Volute from Marion Island to the Crozets. 



(4) Paradmete : Small, solid, Mitra-\ike shells closely allied to the boreal genus Volutomitra. Distribu- 

 tion : Kerguelen Island, off Tierra del Fuego, South Georgia, South Shetlands and Palmer Archipelago. 



Family Turridae 



The Turrids are represented by a number of regional genera of uncertain affinity with those from 

 northern seas. The ' Bela ' complex covers several new genera and others that for the present have been 

 left in this conventional location. 



The large attractive Aforia is a splendid example of ' bipolar ' distribution and has been dealt with in 

 the previous section. Another member of the Cochlespirinae, Leucosyrinx, probably has a connected 

 range up the eastern South American coast in deep water to the West Indies, where similar species to 

 those from the Falklands-Scotia Arc localities are well represented. 



A new genus of the Daphnelliinae, Typhlodaphne, from Magellan and South Georgia to Kerguelen, 

 closely resembles Typhlosyrinx from deep water in the Gulf of Aden. 



Family Acteonidae 



The type genus Acteon, represented by magellanic and antarctic species, is cosmopolitan, but 

 Neactaeonina is restricted to the Antarctic, ranging from South Georgia to the South Shetlands and 

 eastwards to Kreguelen Island and the Ross Sea. Another subantarctic-antarctic genus, Toledonia, 

 ranges from the Falkland Islands to the South Shetlands and eastwards to Kerguelen and the Ross Sea. 



