LAMELLIBRANCHIATA. g. 



Jan Mayen. 



A.borealis has been taken here by the Norwegian North-Atlantic Expedition at to 151m. (Frit 



the Austrian Expedition at 65— 90 fm. (Becher, sub. nom. A.borealis Ch. and A.producta Sow.) and 

 the Danish Expedition of 1900 at 15 and 50 fm. 



Iceland. 



On the west coast a large number of specimens have been taken at many localities, so that 

 the species must be common here. From the north coast and especially from the east coast, on the 

 other hand, we have A.borealis only from a few places and it would thus seem to be comparatively 

 rare in these parts of Iceland. — It occurs 011 sand, clay and mixed bottom-soil; the depths recorded 

 for living specimens lie between 3 and 31 fm. The maximum length is 47 mm . 1 ) 



The various localities are as follows. 



East Iceland: 



Berufjordr, Djupivogr 10 fm. 2 valves. 



Seydisfjordr, at Skulavig 6 - , black sand. 1 spec. 



Lodmundarfjordr ca. 20 - , from stomach of haddock. 1 



Gunnolfsvik. 7 valves. 



These few occurrences might indicate, as mentioned, that A. borealis is comparatively rare on 

 the east coast; and we can hardly consider it due to chance, that this species especially has not been 

 taken by the collectors, when a species of similar size and occurrence such as A. elliptica is to hand 

 from the east coast in large numbers and from rather many localities icf. p. 109). 



On referring to Dr. A. C. J ohan sen, who has explored the coasts of Iceland, this zoologist has 

 kindly given me the following information, which agrees well with what has been said above: "In 

 my notes from Iceland I find Astarte borealis recorded from the beach at Seydisfjordr, but not from 

 Bakkafjordr, Berufjordr or Hamarsfjordr. As I have noted it from the beacli on the south-west and 

 west coasts, from Yestmannaeyjar, Reykjavik, Stykkisholmr and Arnarfjordr, this would indicate, that 

 it is commoner on the shores of the south-west and west coasts than those of the east coast". 



It may however be added, at the same time, that Nils Odhner, who has only had a relat- 

 ively small material at his disposal for his paper: "Marine Mollusca of Iceland"-) is able, nevertheless, 

 to record A.borealis from a locality on the east coast, namely: 



Berufjordr 9 —30 fm. Many spec. 



The largest of our specimens is 44 mm . long, of Dr. Odhuer's 46""". 



North Iceland: 



Thistil Fjordr 10—24 bu , sand and "coral". 5 sp 



Vidarvik 13 1 . - , black sand. 6 spec. & 5 valves. 



M Some separate valves, which are only labelled "Iceland", reach however a much larger size, namely - 

 2 ) Arkiv for Zoologi, Bel. 7, 1910, No. 4. 



