LAMELLIBRANCHIATA. 93 



Jan Mayen. 

 A. borealis has been taken here by the Norwegian North-Athmtic Expedition at io~i5fm. (Friele), 

 the Austrian Expedition at 65 — 90 fni. (Becher, sub. uom. A.borcalis Cli. and A.producta So\v.| aud 

 the Danish Expedition of 1900 at 15 and 50 fm. 



Iceland. 



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

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

 other hand, we have A. bnrcalis onl>- from a few places and it would thus seem to be comparatively 

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

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



The various localities are as follows. 



East Iceland: 



Berufjordr, Djnpivogr 10 fm. 2 valves. 



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



Lodmundarfjordr ca. 20 - , from stomach of haddock. i ~ 



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 |cf. p. 109). 



On referring to Dr. A. C. J oh an 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 vSeydisfjordr, but not from 

 Bakka^ordr, Berufjordr or Hamarsfjordr. As I have noted it from the beach on the south-west and 

 west coasts, from \'estmannae>jar, 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 mav 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.borcalis from a locality on the east coast, namely: 



Berufjordr 9-30 fm- Many spec. 



The largest of our specimens is 44™"'. long, of Dr. Od liner's 46 



mm 



North Iceland: 



Thistil Fjordr 10—24 ^m-, sand and "coral". 5 spec. 



Vidarvik iS'A - , black sand. 6 spec. & 5 valves. 



1) Some separate valves, which are only labelled "Iceland", reach however a much larger size, namely 52—56 



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



mm 



