VI 



sætter vi her en fortegnelse over de skalrester af grundt- 

 vaiulsmollusker, som af Nordhavsexpeditionen faudtes strøet 

 ud over liavdybet. Skalresterne toges paa station 312, 

 74» 54' N. Br., 14» 53' ,0. Lg., 658 fv., og stat. 353, 

 77» 58' N. Br., 5» 10' 0. Lg., 1333 fv. 



Peden islandicus, Milll. Station 312. Flere rudi- 

 menter og et vel bevaret ungt exemplar. 



Yoldia ardica, Gray. Station 312. Tre idige velbe- 

 varede skaller. Station 353, kun et rudiment. 



Yoldia intermedia, M. Sårs. Station 312. Et større 

 og et mindre vel bevaret skal. 



Asfarte horecdis, Chemn. Station 312. Tre umage 

 skaller med vel bevaret epidermis. 



Serripes grønlandicus, Chemn. Station 312. To sam- 

 menhørende skaller med ganske vel bevaret epidermis og 

 et enkelt eroderet skal. Station 353. Friske fragmenter. 



Venus flnduom, Gould. Station 312. Et skal med 

 vel bevaret epidermis. Station 353. To, noget angrelme 

 skaller. 



Lyoisia arenosa. Moll. Station 353. Et frisk rudi- 

 ment. 



Mya iriincata, Lin. Station 312 og 353. Rudimenter. 



Saxicava ardica, Lin. Station 312. Et stærkt slidt 

 større skal og et mindre exemplar med begge skaller in 

 S/tu, og hængselligamentet vel bevaret. 



Margarita hellcina, Phipps. Station 312. Rudiment. 



Lacuna crassior, Mont. Station 353. Et noget lede- 

 ret exemplar. Da det var friskt, var epidermis vel be- 

 varet. 



Troplion clatJryafus. Lin. Station 312. Et stort, 

 noget slidt exemplar. 



Paa medfølgende kartskisse har vi angivet de to sta- 

 tioner, hvor ovennævnte skalrester af grundtvandsmoUusker 

 toges. Samtidig liar vi indtegnet det havstykke, hvor In- 

 golfexpeditionen fandt sine skallevninger. 



I Frieles dagbog fra expeditionen anfører han, at 

 l^aa station 353 bestod ,,bunden af binoculinler med tal- 

 rige, tildels store stene. Trawlbommen kom brækket op". 

 Der anvendtes i 1878 væsentlig beamtrawlskrabninger. Paa 

 en noget vestligere station, station 350, 1686 fv., omtrent 

 midt mellem Spitsbergen og Grønland, tabtes trawlen. 

 Efter erfaringerne fra station 353 er der grund til at an- 

 tage, at det er store stene, som har tynget saa stærkt i 

 trawlen, at tanget In-ækkede. Vi anfører dette for at hen- 

 lede opmærksomheden paa, at der i de store dyb i Gi'øn- 

 landshavet ligger udkastet mange og store stene. 



Det trawlnet, som benyctedes af expeditionen har 

 neppe kunnet trænge mere end nogle faa centimeter ned i 



logical conditions, we give here a list of the shell-remains 

 of shallow-water raolluscs that were found by the North 

 Atlantic Expedition, scattered over the arctic ocean depths. 

 The shell-remains were found at Station 312, in 74" 54' N. 

 Lat., 14" 53' E. Long., at a depth of 658 fathoms, and 

 at Station 353, in 77» 58' N. Lat., 5" 10' E. Long., at 

 1333 fathoms. 



Peden islandicus, Mlill. Station 312, several rudi- 

 ments and a well-preserved young specimen. 



Yoldia ardica, Gray. Station 312. three not equally 

 well preserved valves; Station 353, only a rudiment. 



Yoldia intermedia, M. Sårs. Station 312, one large 

 and one small, well-presei'ved valve. 



Asfarte horecdis. Chemn. Station 312. three valves 

 with well-preserved epidermis. 



Serripes grænicmdicus, Chemn. Station 312, two mat- 

 ching valves with well-preserved epidermis, and a single 

 eroded valve; Station 353, fresh fragments. 



Venus fliiduosa. Gould. Station 312, a valve with 

 well-preserved epidermis; Station 353, two valves soniewhat 

 injured. 



Lyonsia arenosa, Moll. Station 353, a fresh rudiment. 



Mya truncata, Lin. Stations 312 & 353, rudiments. 



Saxicava arctica. Lin. Station 312, a much worn, 

 large valve. and a smaller specimen with both valves ui 

 situ,, and the hinge-ligament in a well preserved state. 



Margarita helicina, Phipps. Station 312, a rudiment. 



Lacuna crassior, Mont. Station 353, a soniewhat in- 

 jured specimen. When tåken out of the dredge, the epi- 

 dermis was in a good state of preservation. 



Trophon datJiratus, Lin. Station 312, a large, some- 

 wliat worn specimen. 



On the accompanying sketch-map, we have marketl 

 the two stations at which the above shell-remains of shallow- 

 water molluscs were found. We have also drawu in the 

 section of ocean in wliich the Ingolf Expedition found tlieir 

 shell-remains. 



Friele, in his diary from the expedition, has an entry 

 to the effect that at Station 353, the bottom 'consisted of 

 Binoculina Clay containing numerous, partly large, stones. 

 The trawl beam came up broken'. In 1878, chiefly 

 beam-trawl dredgings were made. At a somewhat more 

 westerly station, Station 350 (1686 fathoms), about mid- 

 way between Spitsbergen and Greenland, the trawl was 

 lost. From the experience of Station 353, there is reason 

 to suppose that large stones have weighed so heavily in 

 the tiawl, that the rope broke. We report this in order 

 to draw attention to the fact that in the great depths of 

 the Greenland Sea, tliere are many large stones lyiug 

 scattered about. 



The trawl-net employed by the expedition was hardly 

 able to force its way more than a few centimetres into 



