MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 151 



Tapes [Amygdala) exalbida (Chem.). 



Venus exalbida, Chemnitz, Conch. Cat., vol. xi., p. 220, pi. ccii., fig. 1974. 

 „ ,, Reeve, Conch. Icon., vol. xiv., fig. 13. 



,, ,, Sowerby, Thes. Conch., vol. ii., p. clxi., fig. 193. 



Chione exalbida, Deshayes, Cat. Conchif. Mus. Brit,, p. 154. 



„ (OmpJialoclathrum) exalbida (Chem.), Paetel, CataL, iii., p. 85. 

 Tapes [Amygdala) exalbida (Chem.), E. A. Smith, Rep. " Challenger" Exped.: Lamellibr., xiii., 

 p. 1 17. 



Hob. — Port William, Falkland Islands, trawl, January 31, 1904. 



Sub-order myacea. 



Family Glycimeridse. 

 Saxicava arctica (L.), var. antarctica, Phil. 



My a arctica, Linne, Syst. Nat., p. 1113. 



Saxicava arctica (L.), Forbes and Hanley, i., p. 141, pi. vi., figs. 4-6. 

 ,, antarctica, Phil., Archivf. Nature/., 1845. 



Hob. — Grough Island, trawl, 100 fathoms, April 23, 1904; Burdwood Bank, 

 trawl, 56 fathoms, December 1, 1903. 



We consider S. antarctica, Phil., by which name some would designate this protean 

 species, merely as a synonym, or, at most, varietal, there being no salient characters 

 which can be discerned by us as warranting their distinctness. 



Sub-order anatinacea. 



Family Lyonsiidze. 

 [Lyonsia cuneata (Gray). 



Of this or a nearly allied species a single specimen, hardly adult, was found after a. 

 gale in a stranded root of the giant Macrocystis, at Port Stanley, Falkland Islands, 

 February 5, 1904. It has sometimes been considered an Entodesma or Mytilimeria.~\ 



Family Anatinidte. 



Ana Una elliptica, King and Brod. 



Anatina elliptica, King and Broderip, Zool. Journ., vol. v., p. 325. 

 Reeve, Conch. Icon., xiv., fig. 14. 

 Griffiths, Anim. Kingd., xii., pi. xxii., fig. 3. 



Smith, Rep. " Challenger" Exp.: LamelL, Zool., xiii. (1885), p. 76. 

 „ "Southern Cross" Moll., p. 210, pi. xxv., figs. 9, 10. 

 ,, Nat. Antarct. Exped., vol. ii. (Brit. Mus. N.H.), p. 1, pi. iii., 

 fig. 3 (1907). 

 ,, prismatica, Sowb.. P. Z. Soc. Lond., p. 87 (1834). 



Eab. — Station 325, Scotia Bay, South Orkneys. Dredged at 9-10 fathoms. 



A large, well-grown example. Smaller examples from the same locality, these last 



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