SYSTEMATIC 77 



ACKNOWLEDGEMENTS 



The present work would have been impossible of accomplishment by one situated so far away from the 

 libraries and collections associated with the larger and older scientific centres, but for the fortunate 

 chance that the R.R.S. 'Discovery II' refitted in Auckland, New Zealand, during August 1932. 

 Through the kindness of the late Commander W. M. Carey and the scientific staff under Mr Dilwyn 

 John, I was allowed the privilege of referring to the extensive library of Antarctic reports in the ship's 

 laboratory. During the six weeks of the vessel's stay in Auckland I worked constantly, typing relevant 

 sections of text and photographing plates. 



A subsequent visit to Sydney in 1937 enabled the completion of references by working on the 

 extensive collection of separates accumulated by the late Mr Charles Hedley for his researches on the 

 British Antarctic Expedition 1907-9 and the Australian Antarctic Expedition molluscan collections. 



At the Australian Museum, Sydney, I examined their considerable collection of Antarctic Mollusca, 

 and later received on loan from Dr Nils H. Odhner of Stockholm a representative series from the 

 collections made by the Swedish South Polar Expedition. 



My private collection of Mollusca, now deposited in the Auckland Museum, contains much southern 

 material, and this has proved useful for comparative purposes. 



For many requests for other comparative material I have to thank Mr J. R. le B. Tomlin of Sussex. 



To all members of the Discovery Committee who have helped with this work, and to those specifically 

 referred to above, I am most grateful. 



SYSTEMATIC 



PELECYPODA 



Family NUCULANIDAE 



Genus Propeleda Iredale, 1924 



„ , j , • j . Type (o.d.) : Leda ensicula Angas 



Propeleda longicaudata jr \ / a 



Leda longicaudata Thiele, 191 2, p. 229, pi. 17, fig. 22. 

 Poroleda longicaudata Hedley, 1916, p. 18. 

 Propeleda longicaudata Iredale, 1924, p. 186. 



Type locality. Gauss Station, Davis Sea, Antarctica. 

 St. 600. West of Adelaide I., Bellingshausen Sea, 67 09' S, 69 27' W., 17 Jan. 1931, 487-512 m. (one living 

 example). 



Length 16 mm.; height 6 mm. (holotype). 

 Length 21 mm.; height 6 mm. (Hedley, St. X, Davis Sea). 

 Length 26 mm. ; height 10-25 mm - (St- 600). 



As already noted by Hedley (19 16), large examples tend to become proportionately narrower than 

 small ones, e.g. the holotype. The rostrum tends to lengthen disproportionately to the rest of the shell. 



Family LIMOPSIDAE 

 Genus Limopsis Sassi, 1827 

 Type (s.d. Gray, 1847): Area aurita Brocchi, Miocene and Pliocene of Italy 

 Limopsis hirtella Rochebrune & Mabille. 



Limopsis hirtella Rochebrune & Mabille, 1889, p. 115. 

 Limopsis hirtella Lamy, 1911a, p. 25, pi. 1, figs. 18, 19, 20. 



