64 I.AMELUBRANCHIATA. 



in Kiel, 1847, P- XI 5- ~" Modiolaria nigra Morch, Rink's Gronland, 1857, P- 93i Vidensk. 

 Medd. Naturh. Foren. 1867, p. 96; ibid. 1868, p. 224; Arctic Manual, 1875, p. 132; Rink's Dan. 

 Greenland, 1877, p. 442; Posselt, Medd. om Gronland, XXIII, 1898, p. 27; Hagg, Ark. for 

 Zool., Bd. 2, No. 2, 1904, p. 26; Jensen, Medd. om Gronland, XXIX, 1909, p. 328. 



West Greenland. 



The species has been taken at many places from the southernmost part up to Proven (72° 

 23'N. L-), and it will certainly prove to occur even further north, as it has been taken on the American 

 side right up to 78°45' N.L,. '). The depths recorded lie between 10 — 200 fm. It attains to a very 

 considerable size, up to 62 " ,m . 



Regarding this species H. P.C. Moller writes in a manuscript preserved in the Museum here: 

 "This bivalve is living along the whole coast of Danish West Greenland, but only solitary and where 

 the sea is deep (30— 60 fm.) and the bottom is clay. Young individuals are frequently to be met with; 

 the adults on the other hand are rather seldom to be found, because thev conceal themselves dieeing- 

 down deep in the clay." 



East Greenland. 



At. nigra has been taken at 6 localities between Angmagssalik (65°35,' N. L,.) and Cape Borlase 

 Warren (74°2o' N. L.), at depths of ca. 3 — 19 fm. The largest specimen is 45.5 mm . long. 



Iceland. 

 M. nigra has been taken all round the island, at depths of ca. 6 — 50 fm. The largest specimen 

 is not less than 67 mm . long, but as a general rule only small specimens are taken. 

 The various localities are shown in the following lists. 



East Iceland: 



Berufjordr, Djupivogr 6 fm., mud with black sand. 45 spec. 



Faskrudsfjordr 50—20 - , blue clay. 2 — 



Reydarfjordr 44 - 1 — 



Seydisfjordr at Skalanes 8 — 7 - 10 — 



Bakkafjordr ca. 10 - 2 



12 — 15 - , black sand. 1 — 



52 — 43 - Fragments of a large specimen. 



Finnafjordr 18 - 3 spec. 



The specimen from Reydarfjordr is 67""". long, the specimen from the greatest depth in 

 Bakkafjordr has also been of considerable size, but the others are quite small specimens. 



North Iceland: 



Thorshofn 6 fm. 1 valve. 



Axafjordr 22 - 1 — 



( Ifjord at Svalbardseyri 10 — 20 - 4 spec. 



These are small specimens. 



1 rieg: Rep. Sec. Norvv. Arctic Expel, in the "Fram'', No. 20, 1909, p. 9. 



