50 DISCOVERY REPORTS 



The Falkland molluscan check list which follows is compiled from a number of published papers 

 plus the Discovery Committee's material,* described in this report. The principal contributors to the 

 Falkland fauna were Cooper and Preston (1910), Eliot (1907), Melvill & Standen (1907, 1912, 1914), 

 Preston (1913), Smith (1915) and Strebel (1905-8). 



Since the Falkland Islands are situated on the vast East Patagonian Continental Shelf it is not 

 remarkable that the molluscan fauna of these islands is almost wholly Magellanic. A few species appear 

 to be restricted to the Falklands, but their number is bound to be reduced as the Magellanic fauna 

 becomes better known. 



The marine molluscan fauna is Subantarctic with a strong admixture of continental temperate extra- 

 limital forms which have been induced to extend far south of their usual station through the continuity 

 of the Patagonian land mass, which has many sheltered inlets, bays and channels. 



One species of the characteristic Antarctic genus Prosipho occurs, but otherwise Antarctic forms are 

 almost wholly absent. 



Characteristic Subantarctic genera which are well represented are Gaimardia, Cyamiutn, Nacella, 

 Patinigera, Margarella, Laevilitorina, Pareuthria and Kerguelenella. 



The following instance temperate forms induced far south of their normal range : Fissurella (Bal- 

 boaitia), Calliostoma, Polinices, Trochita, Nassarins, Acanthina, Typhis, Adelomelon and Marginella. 



Restricted Magellanic genera are the two Calliostomid derivatives Photinula and Photinastotna, the 

 Trophonids Xymenopsis, Fuegotrophon and Stramonitrophon, and the Buccinoid genera Savatieria, 

 Anomacme and Meteuthria. 



The Atlantic-Indian Ocean cross-ridge has allowed an interchange of several genera and species 

 between the Falklands and the Marion Island-Kerguelen area, notably Trophon declinans, Provocator 

 pidcher, Philine kerguelensis and Notoficula. Also the range of two otherwise restricted Magellanic 

 genera, Glypteuthria and Parmaphorella, has been extended thus to South African waters (Tomlin, 

 1932). This ridge has facilitated also the considerable eastern Subantarctic extension of the 'bipolar' 

 genera Fusitriton and Aforia. 



Falkland Islands Check List 



This check list and those for other areas that follow are provisional only, since I have been unable 

 to examine the actual material upon which many identifications were based. Nevertheless, these lists 

 serve to give an approximate indication of the respective faunule for each biogeographic area. In most 

 instances I have brought the nomenclature up to date, but in a few entries of doubtful taxonomic status 

 the original record is cited, with quotation marks. 



Species preceded by an asterisk are represented in the Discovery material ; (T.) indicates that the 

 type locality for the species is within the faunal area covered by the list, and the authorities following 

 the names refer to the literature cited at the end of this report. 



PELECYPODA 



Nucula falklandica Preston, 1912 (T.). 



N. pi sum Sowerby, 1832; Melvill & Standen, 1914. 



Yoldia eightsii (Couthouy, 1839) Melvill & Standen, 1914. 



Y. woodwardi Hanley, i860; Melvill & Standen, 19 14. 



Limopsis hardingii Melvill & Standen, 1914 (T.). 



*L. hirtella Rochebrune & Mabille, 1889. 



'Philobrya sp.' Melvill & Standen, 1914. 



'Pecten' rufiradiatus Reeve, 1853; Melvill & Standen, 1914. 



Mytilus sp. Melvill & Standen, 1907, 1914 as 'edulis' Linn. 



Editor's Note: By no means all of the Discovery molluscan collections have been reported upon. 



