Mollusca from the North-west Falklands. 133 



declivi, lateribus ad marginem ventralem rotundatis, postice 

 paiillum protenso, pagina intus alba, cardinis deutibus normalibus. 

 Alt. 4*50, lat. 5 mm. 



Hah. Herbert Stream, Roj Cove, on mud ; also in large 

 pond, Port North. 



Interesting, as the first non-marine Pelecypod recorded 

 from these islands. Its nearest congeners, perhaps, are 

 S. novcezelandice, Desh., and S. ovale, Stimps. There 

 appear two forms, one slightly smaller and more oblique. 

 We name it specifically in honour of its discoverers, Mr. and 

 Mrs. Rupert Vallentin, whose researches, both botanical, 

 zoological, and biological, have proved o£ such lasting service 

 to the students of the productions of these remote southern 

 climes. 



Suborder Cardiacea. 

 Cardium edale, L. 



Cardium edule, Linn^, Syst. Nat. p. 1124 ; Forbes & Haaley, ii. p. 15, 

 pi. xxxii. figs. 1-4. 



King George's Bay. 



Suborder Veneracea. 



Fam. VeneridsB. 



Cryptogramma sicbimbricata, Sowb. 

 Venus subimbricata (Sowb.), Reeve, Concb. Icon. xiv. pi. xix, fig. 85. 



Roy Cove Beach, after south-westerly gale ; only one 

 brifijiitly coloured and well-marked half-valve. 



The original locality of this species, hardly to be expected 

 so far south, is Puerto Portrera, Cential America {Hugh 

 Cuming^. We consider its presence in the West Falklands 

 must be owing to adventitious circumstances. 



Gomphina [Aeolus) foveolata (C. & P.). 



Psephis foveolata, Cooper & Preston, Ann. & Mag. Nat. Hist. ser. 8, 



vol. V. pp. 110-114, tig. (1910). 

 Gomphina {Aeolus) foveolata, A. J. Jukes-Browne, Ann. & Mag. Nat. 



Hist. ser. 8, vol. xii. p. 480 (1913). 



Whaler Bay ; Shallow Bay ; King George's Ba}'. 



"VVe are obliged to Mr. II. B. Preston, one of tiie authors, 

 for the identification of this very interesting species, which 

 is, apparently, being found to be generally distributed around 

 the Falkland group. Mr. Jukes-Browne has also kindly 

 favoured us with good specimens. 



