SEA-FISHERIES LABOEATORY. 



239 



4. 



Moussa Sound, Shetland, 11 811. 



Bacteriastrum delicat ulum 



Chaetoceras atlanticum 



boreale 



breve 



cinctum 



constrictum 



criophilum 



debile 



decipiens 



didjanum 



teres 



SPP 



Dactyliosolen tenuis 



Eucampia zodiacus 



Leptocyliiidrus danicus 



Nitzschia seriata 



Rhizosolenia alata 



„ stolterfothii . 



„ styliformis 



Thalassiosira gravida 



„ nordenskioldii 



Dinophysis sp 



Peridinium spp 



Ceratium furca , 



fusus 



intermedium 



lineatum 



longipes 



macroceros 



tripos 



Calanus helgolandicus 



Pseudocalanus elongatus 



Acartia clausi 



Centropages hamatus 



Oithona similis 



Nauplii 



Evadne nordmanni 



Podon intermedium 



Decapod larvae 



Sagit ta 



Limacina retro versa 



Ecliin. plutei 



Tintinnidae 



Oikopleura 



Fish eggs 



Surface. 



53,000 



42,800 



32,750 



1,562,500 



201,600 



176,400 



1,193,000 



5,812.500 



1,250,000 



3,625,000 



438,500 



29,062,500 



54,800 



45,350 



37,800 



7,687,500 



118,450 



141,100 



25,200 



1.900 



115,900 



3,150 



44,700 



19,500 



41,600 



103,300 



171,350 



2,500 



8,200 



252,000 



10 



630 



8,800 



315 



6,900 



3,150 



1,250 



630 



10 



1 



5,000 



2,500 



14,500 



630 



3 



This far-north gathering, in the Shetland Isles, in 

 August, is an undoubted phytoplankton with about fifty 

 millions of Diatoms. It has also, however, an unusually 

 large number of Diuoflagellates, and a fair number of 

 Copepoda and other animals, including 5,000 of the 

 Pteropod Limacina retroversa. 



