LAMELLIBRANCHIATA. 



16 miles E. by S. of south point of Nolso . . 80 fin. 1 spec. & 2 valves. 



13 — W. by vS. of Munken ca. 150 - 12 valves. 



The maximum size of all these shells in only 3.5 



Distribution. Crenella decussata is an arctic and boreal species, ranging in the north to Melville 

 Bay ("Fox"), West and East Greenland, Spitsbergen (Torell and others), Nova Zembla (Leche), Kara 

 Sea (Pfeffer) and Bering Sea (Krause); in the south it readies to Cape Hatteras (fide Dall, 1889), 

 the British Isles : i, Korea and California. In Danish waters it readies to the southern Kattegat The 

 vertical distribution extends from 2— 300 fm. ; Jeffreys' statement, that it goes down to 1750 I'm. 

 probably rests on some mistake. 



According to my measurements the species becomes 5.5 ram . at Greenland, 4.75""". at East Ice- 

 land, 4 mm . at West Iceland and only 3.5 """. at the Faeroes. The size thus decrease in the same pro- 

 portion as the marine climate becomes milder. 



Cardiidae. 



Cardium echinatum Linne. 

 PI. Ill, fig. 11 (young). 



Cardium echinatum Linne, Syst. Nat. ed. 12, 1, 2, 1767, p. 1122; Jeffreys, Brit. Conchol. II, 1863, 



p. 270, PI. 34, fig. 2. 

 Cardinal [Acanthocardia) echinatum Morch, Vidensk. Medd. Naturli. Foren. Kbhvn. 1867, p. 93. 



[Greenland I . 

 Fa.bricius mentions-), that he had seen a weathered valve washed up on the beach. .Since 

 then no one has found the species at Greenland and there is in fact not the least probability that it 

 lives there. 3) 



Iceland. 

 The species, which was not known earlier from this island, has in recent years been found at 

 several places on the south-western, southern and south-eastern coasts. 



S o u t h-W est Iceland: 



Faxafjordr, off Kollafjordr 8— n 1 /, fm., ooze and stones. 1 spec. & 6 valves. 



10 - 3 & 50 



mouth of Kollafjordr 9'/ 2 — 11 - , fine black sand and ooze. 3 & 25 



Keflavik 15 — 16 - , fine black sand. 4 & 40 



') According to Jeffreys the "Porcupine" has taken Crenella decussata on Adventure Bank in the Mediterranean; 

 this statement seems all the mure remarkable as the species is not mentioned either by French or Italian malacologists. 

 Fauna groenlandica, 17S0, p. 409. 



i) Cf. also W.H.Dall in Proc. U.S. Nat Mus. XXIII, 1900, P.38S: "Ca O.Fabricius 17S0, from 



Greenland was doubtless derived from European ballast." 



