SEA-FISHERIES LABORATORY. 



239 



Moussa Sound, Shetland, 11/8/11. Surface. 



Bacteriastrum delicatulum 53,000 



Chaetoceras atlanticum 42,800 



boreale 32,750 



breve 1,562,500 



cinctum 201,600 



constrictum 176,400 



criophilum 1,193,000 



debile 5,812,500 



decipiens 1,250,000 



didymum 3,625,000 



teres 438,500 



spp 29,062,500 



Dactyliosolen tenuis 54,800 



Eucampia zodiacus 45,350 



Leptocylindrus danicus 37,800 



Nitzschia seriata 7,687,500 



Rhizosolenia alata 118,450 



stolterfothii 141,100 



styliformis 25,200 



Thalassiosira gravida 1,900 



„ nordenskioldii 115,900 



Dinophysis sp 3,150 



Peridinium spp 44,700 



Ceratium furca 19,500 



fusus 41,600 



intermedium 103,300 



lineatum 171,350 



longipes 2,500 



macroceros 8,200 



tripos 252,000 



Calanus helgolandicus 10 



Pseudocalanus elongatus 630 



Acartia clausi 8,800 



Centropages hamatus 315 



Oithona similis 6,900 



Nauplii 3,150 



Evadne nordmanni 1,250 



Podon intermedium 630 



Decapod larvae 10 



Sagitta 1 



Limacina retro versa 5,000 



Echin. plutei 2,500 



Tintinnidae 14,500 



Oikopleura 630 



Fish eggs 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 Dinoflagellates, and a fair number of 

 Copepoda and other animals, including 5,000 of the 

 Pteropod Limacina retroversa. 



