DIATO.MACE^ — CII^TOCEROS HOI 



1899 April: 48'^ N. 9° W., rare; Filroes, not rare. 



May: 61° N. 6" W. (very rare); Faroes. 



June: 72" N. 9" W. and 7H° N. 6" W. (rare). 



Si'ptrmhcr: 75° N. 18" E. to 80° N. 13^ ¥.. and 81° N. Ifr W 

 (not rare). 



Tempepature : <>.ii, mean of 15 obs.\ max. 16, min. 1.9. 



Plankton-type. The low temperature and salinity prove that 

 this species i.s to be considered as an arctic neritic foi^m. Its occurence at 

 the north coast of South America in January 1898 is then of the 

 greatest interest. Noted from Jedo Bay, Japan. — N^ and A//. 



CHiETOCEROS DIDYMUS (Eim). 



(Ci.. Bill. Kong!. Sv. Vetensk. Akacl. Haiidl. Vol. XXII; 'A n. 2 PI. I fig. 3, 4.) 



1898 January: 20" N. 18° ^\ 



March: 21° N. 18" W.; 48° N. 6° W.; 58° N. 6" Iv; 4:5^— 



41° N. 41°— 49° W 

 May: 48" N. 33' W., rare. 

 September: 60^ N' 2° W , rare. 



Temperatupe: 12.3, mean of 7 obs., max. 18, min. 6. 



Salinity: 35.a5, mean of 5 obs., max. 35.6), min. 34,59. 



Plankton-type. This species is evidently a neritic form, only 

 occasionally occuring in the ocean, and then among Styli-plankton. 

 Occurs in Jedo Bay, Japan, and in Puget's Sound. Schroder men- 

 tions it from Naple.s. — Km. 



CH^ffiTOCEROS (DIDYMUS VAR.) LONGICRURIS Cl. 



(A Treatise on ttie Phyto-plankton PI. I fig. 11, 17.) 



1898 March : 21° N. 18° W.; 41° N. 21° W.; 42" N. 48" W. 

 April: 42° N. 47" W 

 Ma,y: 49° N. 23° ^\ 

 August: Azores. 

 iJrceiriher: 29° S. 49° W., very common. 



Only such samples considered as contained this species abundantly. 



