DIATOMACK.'I': — CH^.TOCEROS 311 



CHvETOCEROS SOCIALIS T.auder. 

 iCl, Bill. K. Sv. Vet. Akad. Handl. Vol. XXII 3 n.. 4 PI, II fig. 9.) 



1898 April: Faroes. 



June: S. of Iceland, common. 

 July: W. of Iceland. 



1899 July: 74° N. 20° W., common. 



Temperature: O.i to 9. 



Salinity: 31. a-, to 35.1*. 



Plankton-type. This species is an arctic, neritic form, noted 

 from Baffin's Bay. I have met with it in a collection from Puget's 

 Sound. Noted also from Hongkong. It occurs, in the winter, abun- 

 dantly in the Skagerak. — Xy. 



CHiETOCEROS (BOREALIS VAR.) SOLITARIA Gl. 



(Fifteenth annual report of the Fishery Board for Scotland, for 1896 pag. 298.) 



1898 March: 40-— 41° N. 69—70^ W. 

 June: 65° N. 31° W. 

 July: 61°— 62^ N. 4- W. 

 Aayust: (15^ N. 12^^ W.; 76' N. 11° K. 



Temperature: 7.5, mean of 8 obs., max. 11, min. 5.5. 



Salinity : 34.s5, mean of 8 obs., max. 35. si, min. 32.4i. 



Plankton-type. The observations are too few for deciding the 

 plankton-type to which this form really belongs. It has been found 

 both i Styli-, Tricho- and Chaeto-plankton. 



CHiETOCEROS TERES Cl.^ 



(Bih. Sv. Vet. Akad. Handl. Vol. XXII : 3 n. 5 fig. 7.) 



1898 March: S. of Iceland; Faroes; W. of Norway, 58° N. 6' E. 

 April: S. of Iceland; 43° N. 50° W. 

 May: Faroes; 61° N. 1° W. 

 Juiic: Faroes; 58^ N. 2° W.; 74^ N. 23^ E. 

 July: 63° N. 14° W.; common; Faroes, not rare. 



Ostenfeld's data used. 



