Statioii 40. 



Statioii 27 4. 



Astrorhizu arenaria (c), crassaf/iia (c), Coni/isjiiru 

 foJkicea (c), Hypcrammina cloiu/afu (r), B/lociiJ/iia lacvis 

 (v), ardka (r), sjiJicifva (w), Te.rtuluriii. (ii/f/h(t/iiaiis (n), 

 Nodosaria eomiiiiinls [r). pdUjienilii (n), Ghnnhil/iiii lueri- 

 f/ata (c), aequahs (ii), Vaf/iiutJ/na cosfatd (n), rolijiuorphina 

 aii(/i(f:ta (r), aciita (n), Baplophrac/DiiuDi latidon-attuii (v), 

 Plaiiorbidiiia Witllersdorf/i (cj. 



AstrorhJza crassatina (c), PsamniospJiaam fusca (ii). 

 Tlioloaina Jnilla (c), Itliahdannnina ahijamrum (v), discreta 

 (n). Hijpiyaiiiiiiiyia arborescens (r), NoduJiim scorpinra (c), 

 Bilocnliiia KniipJrj: (r), Mdwlhia tncaniiafa (v), sciiihudinn 

 (r), Valvidiua coiiica (r), Nodosai-ia ohJiqua (r), Jlnploph- 

 ragmium crassiuiargo (r), Truncatidina Johaiida (c). 



Paa Hjdroider fra Xorclliavsfxpfditioiifn saaos maiigu I 



ExemplartT af Rupertia og Truncatuliiia fastheftede. i 



De.sudfii vai' ofte en Mængde Thalaniopliorcr liorciide til i 



i'ii hel Del Arter iiitiltrede i Ilydi-oidenies traade. | 



I X()rdhavsex|)editi()npiis Plankton fandte.s ingen pe- 

 lagiske Tlialanio])(>rer. I)ei'iin<id Jiar jeg 1'uiidet mange 

 Exeniplaier af Globigerina Ijulloides i Plankton, der paa 

 Foranstaltning af dr. Hjort Ijlev tåget melleni Trondhjem 

 og Island i April — Juni 1898 j. Disse Globigeriner fand- 

 tes dels med dels aden Pigger dog sjelden i hetydeligt 

 Antal i hver Planktonprave. 



Finnulen Tlialaniophorer saaes i Bnndjn-ovei-ne ofte 

 mange uorganiske Levnuiger af andre Dyreformer. Dog 

 kunde ingen Eadiolarier opdages, skjont enkelte Arter af 

 disse undeitiden forekommer i Plankton fra Nordhavet, 

 saalédes optrreder Acanthonia echinoides Haeckel af og til 

 i uhyre Mængde i Plankton fra Norges Vestkyst, medens 

 en anden Art Acanthostaurus pallidus Haeckel er meget 

 sjeldnere. 



Bemærkninger til Tabellen. 



Folgende Oplysninger er nødvendige til Forstaaelse 

 af Taltellen: 



De under hver Rubrik opforte Tal betegner Antallet 

 af Stationer, hvorfra en Bundprove eller en Prove fra 

 Skrabningeine er undersogt. 



Jeg har inddelt de forskjellige Lersorter ialt i IG 

 Underafdelinger for at vise Thalamopharernes geografiske 

 og bathrymetriske Udbredelso og ikke fordi der altid 

 raader nogen væsentlig Forskjel inden hver af disse Un- 

 derafdelingers Fauna. Det graa Ler er ved Hjælp af den 

 Gode Breddegrad og den lilde La^ngdegrad delt i 3 Dele. 

 hvoraf den sydlige omfatter lo, den nordlige 20 og den 

 østHge 5 Stationer. Af Overgangsleret og Biloculinaleret 

 har jeg adskilt 3 Partier, et .sydligt og et nordligt, der 

 har sin naturlige Grændse i Tvanryggen mellen det norske 

 og det svenske Dyb, .samt et ostligt Parti nu-Uejn Rliab- 

 damminaleret og de; to nævnte Havdyb. Rhabdaniiiiinaleret 

 er delt i 2 Dele ved den Ukle Længdegrad. 



Many sjjecimens of Rupertia and Truncatulina atta- 

 ched were to Hydroida from tlie North Atlantic Expedition. 

 There were frequently moreover, a nuniber of Tiialamopora, 

 belonging to a great many species. enlangled in the tila- 

 nients of the hydroids. 



There ^vere no jielagic Thahnno|)hora, in the North 

 Atlantic I'>xi)edition's plankton. (Jn tiic other hand. I 

 found numy specimens of Globigerina buUoides in plankton 

 which, under Dr. Hjorfs direction, was tåken between 

 Trondhjem and leeland, between the months of April and 

 Juni 189Gj. These Globigerina were found both with 

 and without spines. hut unusually in huge numliei-s in 

 every plaid<ton sample. 



Besides Tliahimophora. many inorganic remains of 

 other animal forms were frequently seen in the bottoni- 

 samples. No Radiolaria, liowever, could be discovered 

 although a few species sometimes oceur in plankton from* 

 the North Sea. In this way Acanthonia ecinnoides Haeckel 

 now and tlien appears in immense numbers in plankton 

 from the west coast of Norway, while another species. 

 Acanthostaurus pallidus Haeckel is far less frequent. 



Remarks on tiie Table. 



The following information is necessary to an under- 

 standing of the table: 



The tigure under each head denotes tiie numher of 

 stations from which a bottom-sample or a sample trom the 

 dredgings has been examined. 



I have divided the various kinds of clay info IG sub- 

 divisiinis in all, in order to sliow the geographic and 

 bathymetric distriltution of the Thalamophora, and not 

 becoause tiiere is always some essential diHerenee in the 

 fauna of eacii of these sub-divisions. The gray clay is 

 divided, by the aid of the 63rd parallel of latitude, and 

 19th of longitude, into 3 parts, of which the soutiiern one 

 includes lo. tlie noi'thern 20, and the eastern 5 stations. 

 I have divided the transition clay and the Biloculina clay 

 into 3 divisions, one southerly and one nortiierly. which 

 having their natural boundaries in the cross ridge between 

 the Norway and the Swedish deep., and an easterly divi- 

 sion between the Rhabdammina clay and the two above- 

 nientioned deeps. The Rhabdammina clay is divided into 

 two parts by the 19tli parallel of longitude. 



Den nordligste Station var fra 0!!» 10 y. B. It" :iO L. AV. 

 5 0. 18'J8. Våndets Tein] erat,ur + 0,8. 



The njost nortiierly station was (ib» 40 N. Lat. & 11» :',U AV. 

 Ijuiiy. Juni 5, ls'i8. Temperature of water: O.S". 



1« 



