LAMELLIBRANCHTATA. 65 



West Iceland: 



Rilni Huk-Straumnses 30 fin., in liaddock. 2 spec. 



Dyrafjordr, inside Thingnaes 10— la'/z - , 'mid and small stones. i — 



Hvalfjordr 24 - i — 



Faxafjoidr, off Kollafjordr 10 - 2 spec. & 2 valve.s. 



— ,- — 8 — ii'/a - , ooze and stones. i — 



— , ca. 2 miles N. E. of Keflavik 19' 2 — 2072 - , ooze. 3 — 



— , 4.3 miles W. 3,'^ S. of Hel- 



gasker Vager 25 - r valve. 



All these are qnite small specimens; the largest (from the first locality) are only 12"'"'. long. 



So nth Iceland: 



Medalland Bngt 47—37 f"i- 5 spec 



These specimens reach a length of np to 33 



mm 



The Faeroes. 



From earlier years we have several specimens of np to 53.5 '"". long, bnt the locality is merely 

 given as "the Faeroes". In recent years M. nigra has been taken at the following places: 



Bordovig 7 — 10 fm., black sand, small stones, La- 



minaria. 18 spec. 



_ 10 - , sand with Laminaria. 5 — 



Kongshavn 5° " 9 ~ 



Vestmanhavn S'A— 5 - , fine black sand. i — 



5 — 6 - , fine black sand. 11 — 



Trangisvaagfjord, head of o-i - i fragment. 



9 miles E. S. E. of Bispen ca. 70 - 4 spec. 



Among the specimens from Kongshavn there are 2 which measnre 39.5 and 43.5""".; the re- 

 mainder are only small specimens. 



The distribution is nndonbtedly circumpolar; Modiolaria nigra has been taken at arctic America 

 (Northumberland Sonnd and Wellington Channel, Jones Sonnd and Rice Strait), West and East Green- 

 land and Spitzbergen, in the Kara Sea, Polar Sea of Siberia and Bering Sea; towards the south it 

 reaches to Cape Hatteras, Dogger Bank and western part of the Baltic, Sea of Okotsk and North-West 

 America. — The vertical distribution extends from ca. 3—200 fm. 



Variation. Modiolaria nigra is subject to no small modification in regard to the form of the shell; 

 as will be seen from the measurements below, the height of the shell in these 17 specimens alone varies 

 from 48.3—58.1 °/o of the length of the shell and the breadth from 29.6—40.8% of the length of the shell. 



The Ingolf-Expedilion. 11. S- ^ 



