MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 137 



Family Lucinidai. 



Diplodonta lamellata, Sm. 

 Diplodonta lameltata, K. A. Smith, Proe. Zonl. .S<-. Lon>/., p 38, pi. v. figs 1-1 c (1881). 



Hob. 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 lamellae 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.S. Alert in the Straits of Magellan and 

 Patagonian coast. 



Cyamium denticulatwm, Sin. 



Cyamium tlentictilatum, E. A. Smith, Nat. Antard. E.(j>ed. : Nat. Hist., vol. ii. p. 3, pi. iii. 

 figs. 4, 46 (1907). 



Hob. 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. 



Cyamium falklandicum, M. and St. 



Cyamium falklandicum, Melvill and Standen, Jovrn. <if Condi., ix. p. 104, pi. i. fig. 12 



(1898). 

 ? Cyamium iridescens, Cooper and Preston, Ann. and May, N.H., ser. viii., vol. v. p. 112, 



pi. iv. fig. 6 (1910). 



This is a variable species, and we consider C. iridescens, 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 COOPER and PRESTON. 



Family Erycinidse. 



Kellyia cycladiformis (Desh.). 



Erycina cycladiformis, Deshayes, Trait, tltm., pi. xi. figs. 6-9 ; Proc. Zool. Soc. Lond., 

 p. 181 (1855). 



Hob. Burdwood Bank, at 56 fathoms. Station 34U. 



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. Saxicavse occurred with them. 



(llOY. SOC. EDIN. TRANS., VOL. XLVIII., 3G3.) 



