HoB DIATOMACKyi.; — TIIALASSIOTHRIX 



Pacilic, at Fuget's Sound. Lemvifjimanx mentions it from I Sara 

 Island, between Vancouver Island and the Hritish Columbia. In the 

 years 1871- To il was exceedingly abundant in the arctic region.s 

 not only along- the coasts, but in the o])en sea. In the years IHiKi 

 — 99' it had not that important part in the arctic plankton. — A/y. 



THALASSIOTHRIX FAUENFELDII Gru\.> 



(Van Heuuck Syii. PI. XXXVII fig. 11—12). 



18!tS Marr/r. 21° N. 18MV., rare; 61° N. IT "W., common; 58^ N. 

 tj E. 



Ajiril: 8!)- N. 24° W.; S. of Iceland; 59-— 60' N. r-— 29^ W. 



May: 60° N. 9 W. to 5T N. 28'^ W., common N. and \V of 

 Rockall. 



Jii/ir: 63° N. 19- W. to 60° N. 7' W., rare. 



July: S. and W. of Iceland; 60 N. 17^ W. 



September: 60° N. 11° W. 



October: 61° N. 5° W. to oT" N. 27^ W., more or less rare. 



Xovciiihi'r: S. Iceland to the Shetlands. more or less rare. 



December: 61° N. 6" W., rare; 62^ N. 10" W not rare. 

 1899 April: -i8" N. 9" W., rare. 



May: 08- N. 4° — 7' E.; common. 



Temperature: Id, mean of 11 obs., max. IT), min. 6. 

 Salinity: H4.lm, mean of 8 obs., max. 35.5.->, min. 26. .-,1. 

 Plankton-type. Noted from Japan. — iVs, 



ReiiKirk. Most of the above data are from (Jfiferifrld. I have 

 found this form only very rarely in the ocean, but very abundantly 

 during the winter and spring in the plankton of the Skagerak. It 

 may be possible that at least some of Ostenfeld's data relate to the 

 varietv Jarn/iica. 



Ostenfeld's data used. 



