KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 7. 



Table 4. S. Skag 0. 57° 41' N., 11° 24' E. 16. VIII. 1912. 



a. 



C 



Tempera- 

 ture °C. 



c 

 o 



'a 

 "3 



v? 



>> 



"tL 



c 



Q 



Ceratiuin 

 bucephalum 



C oS 

 3 (U 



g 2 



° S 



3 a 



'-S 3 



s = 



o 



S 



3 03 

 "2 <-> 



ca 



Ceratiurn 

 longipes 



.2 o 



« o, 



ea ^ 

 O 



Ceratia total 

 numbers 



Proroeent- 

 rum micans 



.2 

 "3 



"3 



o 

 a 



O 



Protocera- 



tium reticu- 



latum 



Peridiniales 

 total • 

 numbers 







16,27 



29,07 



21,16 





200 



80 



60 



10 



360 



850 



920 



230 



140 



2,750 



10 



lti,77 



32,72 



23,83 





180 

 (20 



50 



130 



20 



80 



590 



120 



360 



20 



1,540 



20 



16,04 



33,35 



24,50 



60 



30 



30 



40 





70 



270 



250 



120 





890 



30 



15,ou 



33,51 



24,72 



20 





10 



20 



30 



80 



160 



70 



30 





520 



40 



15,35 



33,69 



24,91 



10 







10 







20 



10 



10 





220 



50 



14,50 



33,75 



25,15 





20 











40 









190 



60 



12,27 



33,69 



25,53 



















10 





120 



80 



10,35 



33,89 



26,05 























100 



liind all through. Differences to note are the greater frequency of Ceratiurn longipes 

 and C. tripos, the latter showing, in the very surface-water, the strongest multiplying 

 on place among all species of this genus. Further the decreasing in number of G. furca, 

 that does no longer predominate, as at S. Extra II. Also Prorocentrum and Olenodinium 

 are less numerous. 



As regards the infusorians (Table 3), for the greatest part represented by different 

 species of Laboea, there has taken place a very lively developing in the surface-water, 

 where a maximum of 4030 ind. per 1 was noted. 



Table 5. S. Skag. 5. 57° 42' N., 9° 51' E. 16. VIII. 1912. 



Q, n, 



ca K* i> 



QS ■- 

 0) 3 



CO 







D 







CO ~ 



>> 



"5 g 



- — 





C 



co 3 



Ca 



JU <n 



Q 





« a 73.2 5 



3 Ti L. ^ : — ■ 



CO 



c3 



T3 



C o 



•SJ2 



c « 



to « r3 ' 



,i ^ w "3 



•s c3 r 

 1 o .5 

 ■S Sä 



« 2 12 



S 77 Ca 



Q S 



ca 

 O 



0Q 



— u. 



■2— £ 



C CS,D 

 T3 O E 



«B 



03 CD 



3 3 



C "S 



a*. 

 '■3 3 



BJ 



01 

 1 S o" 



CO - 



1-1 





 10 



15,55 30,82 



15,89 31,90 



20 I 16,29 33,06 



30 16,13 33,19 



40 I 15,58 33,49 



22,67 



23,46 I 



24,20 



24,36 220 



24,70 450 30 



620 



140 



100 



10 



60 



10 

 10 

 20 





680 



60 



120 



100 



20 



160 



120 



300 



40 



200 



460 



7() 



220 



100 



250 



550 



20 



70 



80 



440 



1,170 



20 



270 



120 



100 

 80 

 130 

 130 

 190 



At S. Skag. 5, situatcd in the Jutland-Current rounding the point of Skagen, the 

 hydrographical conditions ruling are f airly the same as at S. Skag. at corresponding levels. 

 Also the plankton has, as far as concerns the diatoms, the same character, only Rhizosolenia 

 gracillima is more than twice as numerous. But the Peridiniales have quite another 

 distribution through the waters, as will be seen in table 6 beneath. Of the propagation 

 in upper layers, perceptible at S. Extra II and very marked 011 the Swedish side (S. Skag. 

 0) there are hardly any signs at all at this Skagen-station. This can be understood, I 

 think, if the inflowing North Sea-water be arm in itself in Ceratia and other peridinians, 



K. Sv. Vet. Akad. Handl. Bd 57. N:o 7. 2 



