LAMELLIBRANCHIATA. 



83 



Faxafj6rdr,ca.2 iiiilesN.E.ofKeflavik ig'/j— ao'/z ^i"-, ooze. 18 valves. 



— , I mile E. N. E. of Helgasker 



Vager 11' 2 - i spec. 



— ,4.3 miles W. ^;'^S. of Helga- 



sker Vager 25 - 5 valves. 



— ,E. of Videy 9—10 - , fine sand and ooze. i spec. & i valve. 



— ,ca. I' J miles N. W. ■ , N. of 



Engey Baake ^9 - ) shells and stones. i — 



Reykjavik. 3 valves. 



— , Engey 7 — S'/a - , ooze. i spec. & 2 valves. 



Hafuarfjordr 25 - , fine black sand and ooze. i — & 20 — 



From the sontli-west coast (region of Faxafjordr) only separated valves or dead (empty) 

 specimens are represented, though the}- often appear quite "fresh", with well-preserved ligament and 

 periostracnra ; the maximum length is only 53"'"'. Hvalfjordr is however an exception from what has 

 just been said, as living specimens have been taken there, the largest of which is 14"'"'. long; a much 

 larger, but dead specimen appears quite "fresh" and the largest of the separated valves is 61 "'"'. long. 

 On the north-west coast the species thrives well and reaches a length of Jt,'""'. 



[Faeroes.] 



A valve has been taken .south-west of Sydero (6i°9'N.L., 7°54' W.L.) at a depth of 180 fm., but 

 it is quite small (3.75 "'"'.) and looks ancient (fossil). The species does not live at the islands. 



Distribution. Cardium ciliatum is a high-arctic and circumpolar species, as it occurs, apart 

 from West and East Greenland and northern Iceland, at Spitzbergen, in the Barents Sea, at Nova 

 Zembla and in the Kara Sea, in the Polar Sea of Siberia, Bering Sea, at Sitka and in the Wellington 

 Channel; the southern boundary for its distribution lies at Cape Cod (Da 11), East Finmarken (Sars 

 and Friele), northern Japan and Puget Sound (Dall). 



Remarks. The shape of this species varies a good deal, as will be seen from the accompan>ing 

 measurements of 4 specimens from Iceland: 



Length 



Height 



The very small .specimens (see PI. Ill, fig. 10) can only be recognized as belonging to this 

 species on comparing them with somewhat larger specimens because the dorsal margin forms an angle 

 with the anterior margin. The young thus obtain some resemblance to those of C. cchinatiiiii (of. p. 73 

 and PI. Ill, fig. n), but are easily distinguished by the fact, that the radiating ribs are more numerous, 



