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



25 



Table 32. S. Skag. 5. 57° 42' N., 9° 51' E. 25. IV. 1913. 



-c 



© 



Q 



Tempera- 



ture ' C 



o 

 o 



>> 



.-£ 



"3 



cg 



>> 



43 



•3 



a 

 © 



Q 



Amphidi- 

 nium carota 



Gymnodinia 



total 



numbers 



Glenodinium 

 danicum 



Ceratium 



longipes v. 



balticum 



Ceratia 



total 

 numbers 



Peridinia 



total 

 numbers 



Peridiniales 



total 



numbers 



a 



3 



'5 



t3 



o 



w 

 © 



Laboeas 



total 

 numbers 



Protozoa 



total 

 numbers 







0,49 



34,00 



26,72 





650 



400 



50 



150 



100 



1,500 



2,250 



4,400 



0,900 



10 



6,35 



34,22 



26,96 





1,950 



400 



150 



350 



20 



2,970 



3,000 



2,650 



5,800 



20 



5,69 



34,34 



27,10 



150 



2,650 



400 



150 



400 



50 



3,550 



2,700 



2,700 



5,400 



30 



5,42 



34,45 



27,21 



50 



1,000 



250 





150 



100 



1,850 



1,250 



500 



1,750 



40 



5,31 



34,45 



27 22 





640 



100 



20 



20 





780 



650 290 1,010 



50 



5,28 



34,52 



27,28 





240 



20 







20 



360 



120 



80 



420 



Gymnodinia und Protozoa as at S. Skag. 0. The Ceratia are a little more numerous, 

 the development no doubt having to be eonsidered somewhat more advanced in this 

 southern and salt water, than in the eastern and northern parts. 



Table 33. 8. Skag. 6. 57° 56' N., 9° 40' E. 25. IV. 1913. 



A 



O. 

 © 



Q 



Tempera- 

 ture ° C. 



">> ! >> 



.S Ö 



-3 1 © 



CG M 



rhalassiosira 

 Norden- 

 skiöldii 



Thalassiosira 

 gravida 



Paralia 

 sulcata 



Guinardia 

 flaccida 



Leptocy lin- 

 drus danicus 



Rhizosolenia 

 fa-röensis 



Rhizosolenia 



liebetata 

 f. semispina 



Chaetoceras 

 debile 



Chaetoceras 

 decipiens 



Chaetoceras 



diadema 

 with spores 



Chaetoceras 

 sociale 



Diatoms 



total 

 numbers 







6,79 32,74 25,69 



500 









18,100 



700 1,700 



27,200 



1,100 





1,800 



51,000 



10 



5,58 ! 33,69 ! 26,59 











29,900 



2,300 ! 1,500 



9,900 



2,100 



100 



2,500 



48,500 



20 



5,35 34,47 27,25 





200 







15,050 



2,500 1,700 



89,600 



3,400 



1,150 



28,550 



143,450 



30 



5,19 34,58 27,3.". 



3,400 



750 







9,350 



400 1,400 



38,300 



5,850 



1,000 



104,450 



166,050 



40 



5,19 



34,72 27,45 



200 



100 







1,550 



400 ' 650 

 + 50' 



4,200 



200 



1,300 



88,850 



99,050 



50 



5,14 



34,74 27,48 



780 



+ 60 



40 







460 



40 440 

 + 100' 



4,100' 



640 



2,520 



54,860 s 



65,560 



60 



5,10 



34,74 27,48 



700 



300 



760 



280 



180 



20 i 360 

 + 20' 



2,040 2 



360 



620 



46,960" 



* 



54,000 



80 



5,13 34,78 27,51 



1,750 



200 



1,120 





780 



260 

 !+180' 



1.780 2 



380 



1,400 



26,020* 



34,370 



100 



5,12 



34,79 27,52 



1 



380 



+ 40 





120 





1.740 



+ 50 



140 l 80 

 + 240' 



1,180 2 



120 



700 



20,520" 



26,670 



When arriving at the central part of the Skager Rak, Leptocylindrus, that is at home 

 in the more dilute waters of the Kattegat as well as of the Swedish and Norwegian eoastal 

 regions, stays far behind Chaetoceras debile (with a maximum of 89,600 ind. per 1) and Ch. 

 sociale. The latter is here a dominating species, as regards nnmber of indi viduals, with 

 a maximum of 104,450 ind. per 1 noted at 30 m. It is thus a deep-lying form, once because 

 it is more an open-sea species, requiring a salt water and imported to our inner shores by 

 under-currents and then because of its having passed for a large part into the resting- 



1 The undermost numbers deuote a form, twice as tbick as usual. 



2 For a small part with spores. 

 a Mostly sporiferous. 



K. Sv. Vet. Akad. Handl. Band 57. N:o 7 4 



