of the Fishery. Board for Scotland. 



297 



X. — REPORT ON THE PHYTO-PLANKTON COLLECTED ON 

 THE EXPEDITION OF H.M.S. ' RESEARCH,' 1896. By 

 Professor P. T. Cleve, LL.D., of the University of Upsala, Sweden. 

 (PI. VIII.) 



From the Fishery Board for Scotland I received for examination a 

 series of samples collected last summer around the Shetland Islands. 

 Some of the samples were so poor in diatoms and ciliotlagellates that 

 they are omitted in the following account. 



The samples examined were the following :— 



1. Station Jackal II., lat. 61° 45' N., long. 0° 59' W., 30th July, 10 a.m. 



2. „ „ „ „ 1 P^. 



3. „ „ „ „ 3 p.m. 



4. Station Jackal XIII., lat. 61° 1' N., long. 3° 12' W., 31st July, 10 a.m. 



5. „ „ „ „ 11.30 a.m. 



6. „ „ „ „ 2 p.m. 



7. Station Jackal XIV., lat. 61° 20' N., long. 4° 22' W., 4th Aug., 1 1 a.m. 



8. „ „ „ „ 2 p.m. 



9. Station Jackal XVII., lat. 60° 34'5', long. 5° 37*5', 5th Aug., 2 p.m. 



10. „ „ „ „ 3.30 p.m. 



11. Station Knight Errant 28, lat. 60° 2' N., long. 7° 11' W., 6th Aug., 



11.30 a.m. 



12. „ „ „ „ 6 p.m. 



13. „ „ „ „ 8 p.m. 



14. Station Knight Errant 33, lat. 60° 3' N., long. 5° 51' W., 1st Aug., 



10 a.m. 



15. „ „ „ „ 2 to 4 p.m. 



16. „ „ „ „ 3rd Aug., 



11 a.m. 



17. „ „ „ „ 2 p.m. 



The more important forms are named in the following table (p. 298), 

 where r signifies rare and c common, cc very common, + neither rare or 

 common. 



A complete enumeration of the forms, with remarks, will be found 

 later on. In order to get as complete a list as possible, I treated a 

 mixture of all the samples with acids, and examined the cleaned forms. 

 This sample is in the following pages named ' mixed sample.' 



LIST OF SPECIES. 

 A. Diatoms. 



Asteromphalus heptactis (Breb.), Ralfs. (Pritch., PI. VIII. fig. 21 ; 

 Spatangidium Ralfsianum, Norm. M.J. VII. (1859), PI. VII. figs. 7, 8; 

 Asteromphalus Ralfs., A. Sclim., Atl., PI. XXXVIII. figs. 5-8) occurs 

 rarely in some samples, and has been observed by M. Grove in samples 

 from Faro (Knight Errant Exp.) and by various observers in guano 

 from California and Peru. It belongs to the warmer Atlantic. Another 

 species, A. atlanticus, CI., occurs also in the Atlantic, but in company 

 Avith Chcetoceros-species, and seems to characterise the choetoceros- 

 plankton as A. heptactis does the east atlan tic plankton. A. atlanticus 

 is found in Davis Strait, and this summer near Spitsbergen always in 

 choetoceros-plankton. 



