MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 129 



Photinula violacea (King). 



Margarita violacea, P. P. King, Zool. Journ., No. xix., London (1832), p. 346. 



,, ,, Hombr. and Jacquin., p. 59, pi. xiv,, figs. 29-31. 



Trochus violaceus, Philippi, Com-h. Cab., ii., p. 254, pi. xxxvii., fig. 19. 

 Photinula halmyris, Rochebrune and Mabille, Miss. Gap Horn, Paris (1889): " Mollusques," 



p. 89, pi. iv., fig. 6. 

 Photinula violacea, v. Jhering, in Nachrichtsbl. malak. Ges. (1902), p. 98. 



Hob. — Trawl, Burdwood Bank, at 56 fathoms. 



A very nacreous, pink-tinged species, with spire more or less elevated. 



Valvatella antarctica (E. Lamy). 



Margarita antarctica, Ed. Lamy, Exped. Antarctique Francaise (1907), p. 9, planche i., 



figs. 2, 3. 

 , „ " Moll. Orcades du Sud," Bull. Mus. Hist. Nat, t. xii., p. 123 (1906). 



Hob. — Scotia Bay, South Orkneys, 9-10 fathoms, April 1903. Station 325, 

 9 fathoms, August 1903. Macdougal Bay, South Orkneys, at 10 fathoms, December 

 1903 ; also in shore pools in Scotia Bay. 



A smooth, Photinula-like species, but easily distinguished by the deep umbilicus. 

 We follow Mr Edgar Smith (Nat. Antarct. Exped.: Nat. Hist., vol. ii., p. 11) in use 

 of the generic name Valvatella, Gray (1857), and would refer to Proc. Mai. Soc, 

 vol. iii. (1898), p. 205, and Journ. Conch., viii. (1897), p. 472, in justification thereof. 



Sub-order monotocardia. 



(a) Ptenoglossa. 



Family lanthinidse. 



Ianthina exigua, Lamarck. 



lanthina exigua, Lam., Anim. sans Vert., vi., p. 206. 



,, „ Tryon, Man. of Conch., p. 37, pi. x., figs. 17-22. 



Hob.— Station 72, tow-net, lat. 34° 2' S., long. 49° 7' W. 



Small but perfect and characteristic examples, pale, but finely striate. 



(b) Taenioglossa. 



Family Naticidae. 



Natica (Lunatia), sp. 



Ha b.— Surface-dredged by tow-net, lat. 9° 6' S., long. 31° 45' W. 



A few very minute, evidently juvenile forms. They are white, shining, globose, 

 four-whorled, including the small, dark-coloured apical, hardly perforate, mouth large 

 proportionately, operculum corneous, paucispiral. 



