24 



saaledes Polynoe vina. M. Surs. og P. propinqva, Malm- 

 gren, som forekom der i det første Aar; men da jeg hver- 

 ken havde Thermometer eller andre Apparater til Under- 

 søgelse af Våndets Forhold. Bund. Strom f. Ex.. saa har 

 jeg ingen Formodning om Aarsagen til denne faunistiske 

 Skitten, ligesaa lidt som til andre Eiendommeligheder fra 

 samme Sted. som den f. Ex.. at nogne Mollusker, saaledes 

 Eolis lineata, fandtes der i 1876 paa 100 Favnes Dyb, 

 medens den ellers her ved Norges Kyster kun rindes i 

 Tangbeltet. Imidlertid synes det, sum om hverken Dybden 

 eller Temperaturen skulde være det egentlig bestemmende 

 for Dyrenes Forekomst. 



Polynoe islandica. n. sp. 



Stat. 48. 



Et Exemplar, afbrukket noget bagenfor Midten. Det 

 i Alcobol opbeyarede Dyr 8 Ctm. langt og omtrent 3.5 

 Ctm. bredt med Børster. 30 Led. 15 Far Elytrer, der 

 dække hele Ryggen (Tab. I, Fig. 15). (Der medfulgte kun 

 14 Far. men af Fodknuderne kan det sees. at der maa 

 have været 15 Far) Hovedlappen med to afstumpede 

 Spidser fortil. noget hengere end bred; bagerste Par Øine 

 paa Issen, forreste Par midt paa ydre Rand (Tab. I. 



mals belonging to the same family, for instance Polynoe 

 nivea, M. Sårs. and P. propinqva, Malmgren. which had 

 been found to occur there on the first cruise. But happen- 

 ing not to have with me a thermometer, or any other in- 

 strument necessary for investigating the physical conditions 

 of the water of the ocean, nature of bottom, velocity and 

 direction of currents. &C, I can suggest no reason whatever 

 for this partial shifting of the Fauna, nor indeed for any 

 of the other zoological phenomena observed in that region-; 

 for instance, the occurrence of naked mollusca. such as 

 Eolis lineata, at the depth of loo fathoms (1876), speci- 

 mens of that species having never previously beeii taken 

 on the coasts of Norway 'out of the wrack-zone. Mean- 

 while, it would seem that neither depth nor temperature 

 exerts with these animals an»y material influence on the 

 choice of a habitat. 



Polynoe islandica. n. sp. 



Stat. 48. 



One specimen only, with hind part body broken off a 

 little posterior to the middle. Extreme length S'", breadth 

 about 3.5 m . This individual, preserved in alcohol, has 36 

 segments, and 15. pairs of elytra 1 covering the whole of 

 the back, PI. I. rig. 15. (Only 14 pairs were actually 

 counted, but the pedal protuberances plainly show the ori- 

 ginal number to have been 15). The lobe of the head, 

 with two obtuse points anteriorly, somewhat longer than 



