27 



April 30th, 1897. Rost. Plancton taken in the surface at the ] 

 quay of Glea. 



Planorbulina refulgens. d'Orb., many specimens 



lobatula, Walk & Jacob, 

 coronata, Park & Jones, one 



akneriana, d'Orb., two 



Uvigerina angulosa, Will., some 



Cassidulina laevigata, d'Orb., 



Globigerina bulloides. d'Orb., 



Operculina ammonoides, Gronov, one 



Polystommella striatopunctata, Park & Jones, two 



Uvigerina pygmaea, d'Orb.. 



Bullimiua marginata, d'Orb., one 



Haplophragmium canariense, d'Orb., 

 glomeratum, Brady, 



Miliolina seininulum, Lin., 



Nonionina depressula, Walk & Jacob, two 



stelligera, d'Orb., 



Textularia williamsoni, Goes, some 



Pulvinulina concentrica, Park & Jones, 

 March, 5th, 1897. Ostnes-fjord, Lofoten. Plancton from 60 in. 



Planorbulina lobatula, Walk & Jacob, many specimens 



refulgens, d'Orb., 

 akneriana, d'Orb., two 



Operculina ammonoides, Gronow, 



Discorbina globularis, d'Orb., one 



Cassidulina laevigata, d'Orb., some 



Nonionina depressula, Walk & Jacob, two 



Miliolina semigumum, Lin., one 



April 28th, 1897, m., Rost. 



Planorbulina lobatula, Walk & Jacob, many specimens 



refulgens, d'Orb.. 



coronata, Park & Jones, two 



akneriana, d'Orb., some 



Uvigerina pygmaea, d'Orb., 

 angulosa, Will., 



Polymorphism compressa, d'Orb., one 



Cassidulina laevigata, d'Orb., some 



Globigerina bulloides, d'Orb., 



Nonionina depressula, Walk & Jacob, 



Haplophragmium nanum, Brady, two 



Pulvinulina concentrica, Park & Jones, one 



Discorbina obtusa, d'Orb.. 



Lagena lucida, Will. var. nordgaardi, n. v. two 



Description of the new var. 



Pyriformis aut ovalis, vix compressa, obtuse mar- 

 ginata, utrinque costa lata praedita, entosolernica, 

 apertura ovalis magna. Long. 0.33 mm. 



This nice form is pear-shaped or oval, and scarcely compressed 

 from the sides, the keel is obtuse and has on either side a parallel- 

 running, thickened stripe, which ends above in a rounded point at 

 a distance of about one third of the length of the shell from the 

 mouth-opening; below it is somewhat bent upwards and somewhat 

 narrowed by the button-shaped thickening that the shell ends in. 

 This stripe is by transparent light dark, by surface light it is 

 white, the elevation of it being quite small. At the mouth the 

 shell is squarely cut off, at the lower end it is drawn out into an 

 obtuse prolongation. The species reminds one very much of I. 

 qttadricostata, Reuss, but is distinguished from the latter species by 

 the form of the stripes, the almost ball-shaped shell, and by the 

 oblong aperture, which is pointed to both sides. 



Two specimens were found by Mr. 0. XOEDGAABD at Rost in 

 Lofoten, and were called after him". 



At the present stage of my investigations of animal plancton 

 at our coasts, it is impossible to give any general description. 

 What has till now been done in this field must rather be , said to 

 be of a reconnoitering kind. I have tried to obtain knowledge of 

 the forms, their horizontal and vertical distribution, but have till 

 now undertaken no quantitative plancton determinations. Of course. 

 I have seen that there is great difference in the quantity of animal 

 plancton in the months of September and February, for instance. 

 In Lofoten it is rather poor in the latter month, especially in the 

 surface strata, as is also the case in the fjords near Bergen. Both 

 animal and vegetable plancton, however, is found also in the month 

 of February. Arctic copepods, as metridia longa, eiichceta norvegica; 

 and calanus hypcfborms, I have scarcely ever taken in the surface 

 strata (0 50 m.). But in the deep, where the temperature has 

 been about 6 C., and the saltness 34 35 % , m. longa and c. 

 hyperboreans have occurred in greater numbers, especially in Lofoten. 

 Near Bergen too, I have observed a few specimens of the above- 

 mentioned arctic copepods. Recently there occurred further a 

 female of hctarocJueta norvegica (By-fjord, Aug. 24th, 1897, 300 

 m.). The occurrence of arctic copepods in our waters can scarcely 

 be used to support the so called ''current hypothesis". It is likely 

 that dr. HJOET is right in saying that these animals occur in the 

 deep of the fjords because arctic conditions ;ire prevailing there. 



Through a seal-hunter at Tromso I have obtained some 

 plancton samples from the sea between Norway and Spitsbergen, 

 taken in the summer season. In some of these occur great 

 numbers of calanus In/perboretis from the surface strata. At our 

 coast, however, 1 have, as mentioned above, hitherto only taken 

 this species in somewhat deeper water. What appears particularly 

 characteristic of arctic conditions, is the great uniformity throughout 

 the year of temperature and saltness, and it is therefore likely 

 that tbe arctic animal forms occurring in our waters keep in the 

 deep, because the physical conditions there are most corresponding 

 to those of the Arctic Ocean. 



I thus think I have observed, in the case of several arctic 

 copepods, that in our waters they are chiefly bound to the deep, 

 and this circumstance may be one of the conditions that cause their 



