18 ARKIV FÖR ZOOLOGI. BAND 7. N:0 4. 



Leda perniila (Muller). 



Berufjord, 9 — 40 fms, clay, corals, sand, shells, many sps., 

 max. 1. 25,5 — Hofsos, 40 fms, clay, many sps., max. 1.22,5. 



Leda miiiiita (Muller). 



Arnanes, 25 fms, 5 sps., max. 1. 11 — Berufjord, 25—40 

 fms, clay, many sps., max. 1. 15 — Hofsos, 40 fms, clay, 3 

 sps., max. 1. 11 — Raufarhofn, 25 fms, 2 sps., max. 1. 10 — 

 Reykiavik, 8 fms, stones, 4 sps., max. 1. 11,5 — Thistilfjord, 

 10—16 fms, sand, clay, 3 sps., max. 1. 13,5 — Öfjord, i sp., 1. 9. 



Yoldia limatula Say. 



Fig. 24. 



Arnanes, in fish stomachs, many sps., max. 1. 40 — Hof- 

 sos, 40 fms, clay, max. 1. 36 — Öfjord, 50 fms, clay, many 

 sps., max. 1. 40. — Torell 1859. 



Yoldia liyperborea Torell. 



Fig. 23. 



Berufjord, 40 fms, 2 sps., max. 1. 30 — These two speci- 

 mens differ from the preceding ones in having a more blunt 

 posterior end, because of the postero-inferior margin being 

 more curved. By tbat they show agreement with Torell's 

 Y. liyperborea. The other specimens of Yoldia resemble the 

 american Y. limatula Say, to which they have therefore been 

 referred. 



Cardium ciliatiim Fabricius. 



Berufjord, 40 fms, clay, many sps., max. 1. 54 — D:o 9—13 

 fms, rocks, 3 sps., max. 1. 14 — Hofsos, 40 fms, clay, 2 sps., 

 max. 1. 9 — Reykiavik, 8 fms, stones, 3 sps., max. 1. 8,5 — 

 Siglafjord, 12 fms, 10 sps., max. 1. 7,5 — Thistilfjord, 10—16 

 fms, sand, clay, 5 sps., max. 1. 11 — Ofjord, 4 sps., max. 1. 13,6. 



Cardium groeiilaiidicum Chemnitz. 



Arnanes, in fish stomachs, 2 sps., 1. 9,5 — Berufjord, 7 

 — 33 fms, clay, many sps., max. 1. 16,5 — D:o 15 — 30 fms, 



