I.AMRLLIBRANCIIIATA. 



ca. 27 (against ca. 19 in C.echinatum) and have a much finer spination; further, the posterior margin 

 rises almost vertically (in C.echinatum on the other hand the posterior margin bends forwards). 



Cardium elegantulum (Beck) Moller. 

 Cardium elcgantulum (Beck) Moller, Index Moll. Groeul., 1842, p. 20; Gould & Binney, Rep. Invert. 



Mass., 1S70, p. 141, fig. 451; Sars, Moll. Reg. Arct. Norv., 1878, p. 47, PI. 5, fig. 5. 

 Cardium elegantulum Morch, Rink's Gronland, 1857, p. 92; Vidensk. Medd. Naturh. Foren. 1868, 

 p. 220; Arctic Manual, 1875, p. 132; Rinks Dan. Greenland, 1877, p. 441 ; Posselt, Medd. 0111 

 C.ionland, XXIII, 1898, p. 56; Jensen, ibid. XXIX, 1909, p. 352; Odhuer, Ark. f. Zoologi, 

 Bd. 7, No. 4, 1910, p. 19. 



West Greenland. 



The species has been taken here at several localities, from Julianehaab (6o°43' N.L.) to Upernivik 

 |7'N.L.); it keeps mainly to clay bottom and depths of 20 -100 fm. It reaches a length of I5 mm . 



East Greenland. 



The Danish Expedition of 1898 — 99 took a specimen of 12 mm . in length at 65°39'N.L., namely 

 at Tasiusak, 20 — 30 fm., stony ground with sparse algal vegetation. 



Iceland. 



It has only been taken here at some few places and only on the north-eastern part of the 



island [between Berufjordr on the east coast and Thistil Fjordr on the north coast). The various places 



are as follows: 



East Iceland: 



Mouth of Berufjordr 54— 41 fm., ooze. 3 spec. & 6 valves. 



Off Borgarfjordr 80 - 2 valves. 



The largest specimen is 12 mm . long. Odhuer (I.e.) also records some few specimens from 



Berufjordr. 



North Iceland: 



N. of Lauganes 70 fm. 1 spec. 



Thistil Fjordr 50 - 1 valve. 



The largest specimen is 9.5""". long. Odhner (I.e.) records further a young specimen from 

 Thistil Fjordr, 10— 16 fm. 



Distribution. C. elegantulum is an arctic species, which is found, apart from West and East 



Greenland and North-East Iceland, only at north-western Norway (to Tromso) at depths of (io) 15— 



127 fm. (Sars, Sp.-Sch 11 eider, Friele & Grieg) 1 ). -■ It has been found as fossil by M.Sars at 



') Both G.O.Sars and H.J. Posselt give the east coast of N.America as habitat for this species, but this is un- 

 doubtedly a mistake; both of these authors have probably assumed that Cardium elegantulum is American, because it was in- 

 iould in his work on the Invertebrates of Massachusetts (I.e.), but Gould does not give any American locality, 

 only Greenland. Nor have 1 been able to find the species as American in other lists of Packard, Dall, Bush, Whiteaves 

 thus, it is only mentioned as from Greenland by W. H. Dall in his "Synopsis of the Fain. Cardiidae and of the North 

 American Species" (l'roe. U. St. Nat. Mus. XXIII, 1900, p. 386). 



