MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 363 
Family Lucindez. 
Duplodonta lamellata, Sm. 
Diplodonta lamellata, E. A. Smith, Proc. Zool. Soc. Lond., p 38, pl. v. figs 1-1 ¢ (1881). 
Hab.—Burdwood Bank, south of the Falkland Islands, at 56 fathoms. Station 346. 
A right and left valve, hardly adult, but showing the characteristic generic 
dentition, as well as the concentric lamellar ornamentation, which led to the bestowal 
of the trivial name. These lamellee appear in our small specimens more numerous, but 
we can but believe them identical, as they agree in form, and every other detail. The 
type was discovered during the survey of H.M.S8. Alert in the Straits of Magellan and 
Patagonian coast. 
Cyamium denticulatum, Sm. 
Cyamium denticulatum, E. A. Smith, Nat. Antarct. Exped.: Nat. Hist., vol. ii. p. 3, pl. ili. 
figs. 4, 4b (1907). 
Hab.—Burdwood Bank, 56 fathoms. Station 346. 
A curious though minute species, conspicuous for its marginal denticulation and 
radiating impressed lines, which are seen more clearly with the aid of a lens. 
Cyannum falklandicum, M. and St. 
Cyamium falklandicum, Melvill and Standen, Journ. of Conch., ix. p. 104, pl. i. fig. 12 
(1898). 
1 Cyamium wridescens, Cooper and Preston, Ann. and Mag. N.H., ser. viii., vol. v. p. 112, 
pl. iv. fig. 6 (1910). 
This is a variable species, and we consider C’ wridescens, Coop. and Prest., probably 
one of its extreme forms. We have examined a large number of examples, in all stages 
of growth. The specimens collected at Hearnden Water, Station 349, are as iridescent 
as those so named by Messrs Cooprr and Preston. 
Family Erycinde. 
Kellyia cycladiformas (Desh.). 
Erycina cycladiformis, Deshayes, Trait. élém., pl. xi. figs. 6-9; Proc. Zool. Soc. Lond., 
p. 181 (1855). 
Hab.—Burdwood Bank, at 56 fathoms. Station 346. 
We have already recorded this (loc. cit., p. 149), but it is worthy of record that 
nearly all the subsequent specimens from the same locality that have since come into 
our hands were found living inside the valves of defunct Brachiopoda, and are therefore 
in first-class condition. Saaicave occurred with them. 
