357 

 Saxicava arctica Linné. 



1899. Tasiusak 5—20 fms. Stony ground with algae 



8 specimens. 



1899. Tasiusak 20 — 30 - Stony ground with algae 



4 specim. (empty). 



1901— 02. Tasiusak-Fjord 11 — 



1901—02. Angmagsalik Fucaceae 3 — 



1901 — 02. Tiningnekelak 1 — 1 — (tiny). 



1901— 02. Angmagsivik Va- 5 — 1 — 



1900. Cape Dalton 9—11 — Clay 10 — (6 empty). 



1900. Henry-Land 20 — 5 — (young ones). 



1900. Turner-Sound ca. 3 — 4 — (3 empty). 



1891— 92. Scoresby-Sound 60—10 — 4 — 



1891-92. Gaaseland 2 — 



1891— 92. Danmarks-O 1 — 



1891— 92. Hekla-Havn 5 — Mud Several- 



1900. Hurry-Inlet 7—0 — Sand and clay 5 — 



1900. Hurry-Inlet 10 — Clay 13 — (2 empty). 



1900. The mouth of Hurry-Inlet. 50 — Claywith stones 2 — 



1900. Forsblad-Fjord 90—50 — Clay with stones 4 — (2 empty}. 



1900. Cape Borlase Warren .... 10 — 6 — 



1900. Sabine-Island Laminarians 1 — 



The species was previously taken by the Nordenskiöld- 

 Expedition of 1883 off Angmagsalik, 25 — 40 fms., clay with 

 stones (several specimens). By the Kolthoff- Expedition of 

 1900 in Mackenzie-Bay, N. of Franz Joseph-Fjord, at depths 

 of 6V2 — 19 fms., muddy ground (many specimens), at 6V2— - 

 10 fms., mud (3 specimens) and at IV2 — 5V2 fms., mud and 

 sand (1 specimen), and SE. of Walrus-Island (74° 30' N. 18°40'W.) 

 at 42 — 53 fms., mud and stones (2 specimens). By the Ger- 

 mania-Expedition it has been taken at Shannon-Island, at a 

 depth of 30 fms. 



This exceedingly variable bivalve occurs at East-Greenland 

 mainly under the following forms: 



A typical агс^гса -form, obliquely square, with the anterior 

 end very short, abruptly bent down and with the foremost 

 dorsal area sunken; two diagonal spiny ribs which however 

 efface or disappear on the older parts of the shell. The 

 maximum length is 26 mm. 



