76 "TERRA NOVA" EXPEDITION. 



47. LniHijifiifs lillii'i, n. sp. PI. I, fig. 18. 



Shell <|imdrately rounded, rather convex, a little inequilateral, very slightly 

 broader behind than in front, covered with a yellowish pilose periostracum ; hairs very 

 short, glossy, golden, crowded, arranged in concentric and radiating series, some of the 

 latter, g-f millim. apart, having coarser setae than the very delicate intervening series; 

 valves rather thin, a little shorter in front than behind, broadly curved anteriorly, a 

 little higher and less curved posteriorly, veutrally very broadly arcuate, white within, 

 very delicately radiately striated, except a narrow smooth band along the lower 

 margin, and a smooth space on each side defined by a faint ridge enclosing the large 

 subpyriform adductor-scars; margins smooth, not creuate ; hinge-plate narrow, with 

 three or four denticles on each side of the elongate triangular ligament ; umbones 

 obtuse, eroded at the tip. 



Length, 14 mm. ; height, 13 ; diameter, 7. 



Stations 331, 339. McMurdo Sound, 250 and 140 fathoms. 



This species is apparently quite distinct from any of the known Antarctic forms 

 of Liinopxlx, and is chiefly distinguished by its beautifully and delicately setose 

 periostracum, and also by the unusually broad form. A single valve from Station 339 

 is rather narrower posteriorly than the type from Station 331. 



48. Limopsis grandis, Smith. 



Limopsis grandis, Smith, " Discovery " Larnellibranchiata, p. 5, pi. Ill, figs. 7-7 B (1907) ; 

 Thiele, Deutsche Siidpolar -Exped., vol. XIII, p. 228. 



Station 355. McMurdo Sound, 300 fathoms ; also off new land, south of Ballene 

 Island, in 200 fathoms. 



A number of specimens in fresh condition, showing that the periostracum is light 

 brownish rather than " yellowish," as originally described. 



It has been suggested by E. Lamy* that this species is the same as L. jousseaumei, 

 Mab. and Rochebr., but on the other hand Dr. Thiele has shown that they are distinct, 

 on account of certain hinge-characters. 



49. Adacnarca nitem, Pelseneer. 



Adacnarca n'ltenx, Pelseneer, Voy. " Belgioa," Mollusca (1903), pp. 24, 41, pi. VII, figs. 83-88 ; 

 Smith, " Discovery " Lamellibranchiata, p. 5, pi. Ill, tigs. 6-6c ; Lamy, Exped. Antarct. 

 Fram;., Pulecyp., p. 19 ; id., Deuxieine Exped., Pelecyp., p. 27 ; Thiele, Deutsche 

 Siidpolar-Exped., vol. XIII, p. 228 ; Hedley, Brit. Antarct. Exped. 1907-9, Biol., vol. II, 

 Mollusca, p. 3. 



Stations 194, 316, 338, 339, 340, 356. Depths, 50-250 fathoms. 

 Apparently a circumpolar form. 



* Deuxieme Exped. Antarct. Franc., Pelecypodes, p. 20. 



