LAMELLIBRANCIIIATA. 71 



16 miles E. by S. of south point of Nolso. . 80 fm. i spec. & 2 valves. 



13 — W. by S. of Muiikon ca. 150 - 12 valves. 



The maxiniiim size of all these shells in only 3.5 ""^. 



Distribution. Crcnclla dcaissata is an arctic and boreal species, ranging in the north to Melville 

 Bay ("Fox"), West and East Greenland, Spitzbergen (Tor ell and others), Nova Zeinbla (Leche), Kara 

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

 the British Isles M, Korea and California. In Danish waters it reaches to the southern Kattegat. The 

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

 probably rests on some mistake. 



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

 land, 4 '""'. 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. II (young). 



Cardiuvi cchinatuiu Linne, Syst. Nat. ed. 12, i, 2, 1767, p. 1122; Jeffrey.s, Brit. Conchol. II, 1863, 



p. 270, PL 34, fig. 2. 

 Cardiuvi (Acaiif/iocardia) ccliiiiatniii Morch, Vidensk. Medd. Naturh. Foreu. Kbhvn. 1867, p. 93. 



[Greenland]. 



Fabricius mentions'), that he had seen a weathered valve wa.shed 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. 



South-West Iceland: 

 Faxafjordr, off Kollafjordr S-ii'/^ fm., ooze and .stones. i spec. & 6 valves. 



— - — 10 - 3 - & 50 — 



— mouth of Kollafjordr 972—11 - , fine black sand and ooze. 3 — & 25 — 



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



I) According to Jeffreys the "Porcupine" ha,s taken Crenella decussala on Adventure Bank in the Mediterranean; 

 thi.s statement seems all the more remarkable as the species is not mentioned either by French or ItaHan malacologists. 



?) Fauna groenlandica, 17S0, p. 409. 



3) Cf. also \V. H. Dall in Proc. U.S. Nat. Mus. XXIII, 1900, p. 3S8: "Cardium fchnwliim, O. Fabricius 17S0, from 

 Greenland was doubtless derived from luirojiean ballast." 



