LamellibranchiaTa. i j 



Seas under this name [L. elliptica]. Unfortunately the name had been used in August 1861, by 

 Whiteaves (Ann. Nat. Hist. ser. 3, vol. VIII, p. 146) for a fossil from the "Corallian Oolithes of Ox- 

 ford". Under these circumstances, as I am unable to trace any other nana- applicable to the- recent 

 shell, I propose to name it Lima gwym\ 110111. now" 



Lima hyperborea Jensen. 

 PI. II, figs. 5 a — e. 

 Limatula hyperborea Jensen, Medd. 0111 Gronland, XXIX, 1909, p. 329, figs. ia-d. 



The shell oval or elliptical, extremely tumid, white or yellowish white with a faint lustre. 

 The valve is thin, slightly oblique, with the anterior margin forming a slight, regular curve, the 

 posterior margin somewhat more strongly curved outwards above, with ca. 24—36 fine, but distinctly 

 elevated, sharp radiating ribs, disappearing outwards towards the sides, two of the central ones as a 

 rule stronger and with larger interspace than the others, thus producing a fairly well-marked furrow, 

 lying almost medially or a little to the anterior side of a line through the middle of the valve 

 (sometimes however only one prominent median rib); the concentric striatum extremely fine; the 

 beaks prominent; the hinge-margin relatively long, almost straight, passing into the lateral margins 

 at an obtuse angle; the cartilage-pit triangular; the inner side glistening silver)' white or of a pearly 

 lustre. Height 15"""., length 9.5"""., breadth g mm . 



The "Ingolf" has taken this species at: 



St. 116. S. of Jan Mayen 371 fm. — 0.4 C. 1 spec, and fragments 



of 2 valves. 



- 139. N. of the Faeroes 702 - — 0.6 - 2 spec. 



Whilst the specimen from St. 116 is 20 """. high, the largest from St. 139 is only 4.5""". 



Lima hyperborea was originally described by me from East Greenland, where it was taken 

 bv the Danish Kxped. of 1900 at the following places: 



Fleming Inlet 118 fm. clay. 1 spec. 



Forsblads Fjord ca. 50 - clay with stones. 1 



Forsblads Fjord 90 — 50 - clay with stones. 12 spec, and 14 valves. 



The largest of these specimens measures: height 16.5"""., length 10 n,m . 



Distribution. In addition to at R Greenland Lima hyperborea lives at Jan Mayen and in the 

 "cold area" N. of the Faeroes, at Spitzbergen and in the Kara Sea (40 -70611.)'), from which I have 

 seen specimens preserved in the Stockholm State-Museum. It also lives presumably in the Barents 

 .Sea and in the cold Norwegian Sea, where "L.subovata Jeffr." is said to have been taken at several 

 places, according to Friele and Grieg 2 ), as confusion with the present species has probably occuri 

 The same also holds good probably with regard to the "Lima elliptica Jeffr." taken by the Dutch 



') The- specimens from the Kara Sim were referred by W.Leche t.. / (Leach) l..>\en; Kongl. Sv. Vet. 



Akadeniiens Handl. Bd. 16, No. 2, 1S7S, p. -, | 



2 ) Norw. North-Atlantic Exped. Zool., Mollusca MI, [901, p. 7. 

 The Ingolf-Expedition. II. s- 



