LAMELLIBRANCHIATA. 



95 



Faxafjordr, i mile E. N.E. of Helgasker ii'/iim. 



— ,1 — W. of Helgasker... 13—16 - , shell-gravel and stones. 



— , 7 miles N. N. E. of Skagens 



Light 17 — 20'/ 2 - , sand and shells. 



Reykjavik 



— , beach. 



— 8 - 



— (Engey) ?— S'A - , ooze. 



Hafnarfjordr 



— 3-4 - , ooze. 



The largest specimen is 47 """. long. 



I spec. 

 10 valves. 



spec. & 10 valves. 



3 — 

 I — 



& 3 



South Iceland: 

 Vestmannaeyjar, beach. 



— , harbour '^ — o fm. 



— 30 - . gravel. 



— 49 - ) clay with a little mud. 



— , Heimaey, beach. 



63°2i' N.L., i7°3i' W.L 69 - , black sand. 



63°2i' — I7°i5' — 58 - , sand, stones, shell-gravel. 



63°42' — i6"32' — 29 - 



The largest specimen is 39 "'"'. long. 



5 spec 



7 — 



3 — & 3 valves. 



I valve. 



3 spec. & 23 — 



I valve. 



I — 



3 spec. 



[The Faeroes.] 



Landt recoTds " Venus borealis" as "taken at the bottom of Vestmanhavn Fjord"'), and Morch 

 states, that a very large specimen of Astarte sevnsulcata Leach was received from the pastor P. Holm, 

 who had collected at the Fseroes^). As A. borealis has not been found however during the extensive 

 investigations of recent years, these records probably are mistakes, and I believe myself entitled to 

 remove A. borealis from the fauna of the Faeroes, unless certain records are forthcoming. 



Remarks. At Iceland and Greenland Astarte borealis is very variable, both in regard to 

 form and sculpture of the shell and the structure of the periostracum. 



Periostracum. On the Icelandic specimens the periostracum may form a thin layer, smooth 

 or finely fibrous towards the margin, or it may be somewhat thicker and as if frayed; the smooth 

 periostracum is most frequently fairly light-coloured, yellowish-brown and somewhat glistening, the 

 fibrous kind is darker, brown or almost quite black. 



In the West Greenland .specimens the periostracum varies in the same way. 



In all my specimensfromEastGreenland the periostracum is brown to swarthy, thick and bast-hke. 



1) Landt: Forsog til en Beskrivelse over Faeroerne, 1800, p. 289. 



2) Morch L c. 1868, p. 95. 



