352 hIA'J'O.MACI.I'; — SKKLKTOXEMA, STEPHAXOI'YXIS 



SKELETONEMA TROPICUM Cl. 



(K. Sv. Vcl. Akad. Handl. Vol. XXXIV ii. 1 PL VII iv^. HO, Hl.i 



180<S JdiiiKirij: i'r N. o5^ W. 

 March: ~r N. 55^ W. 

 June: 10^ N. 5H' W., very common. 

 December: 29^ S. 49^ W. 



Tempepature; 25. s mean of 5 ohs.. max. 'll.-i. min. 2H..s. 

 Salinity: 34. 53 and 36.oi. 

 Planlcton type: Xi. 



STEPHANOPYXIS TURGIDA CiREv. 



(C resell- rlli a I. Grev. Micr. .louni. Vol. VII, 18r,!i, I'l. VIII fig. 14-.) 



1898 Jaiuuirij: 21^ N. iT W. 

 Februarij: 6=— 5' S. 12°— 9° E. 



March: \r N. 17^ W.; 21° N. 18^ W.; 40- N. 70' W. to 47° N. 



27° W., common at 41° and 45 W. 

 April: 40° N. 70° W., rare; area between 40° N. 41° W., 



1-7° N. 40° W. (common) and 48° N. 33° W; 50° N. 3° W. 

 May: 48^ N. 30^ W., rare and dead. 

 Jane: 41° N. 9° W., very rare. 

 October: 41° N. 67° W., not rare. 

 Xoveiabe/': 41° N. 66° — 69° W., more or less rare; 51 N. 



20" W., not rare. 

 Decembei': 41° N. 66° W., very rare. 



1899 Janaarij: Canaries, rare; 41° N. ()9° W., rare. 

 Febriiarji: 34° N. 40° W., common. 



Temperature: 13.7, mean of 35 obs., max. 27.3 min. 6. 



Salinity: 34. .s3, mean of 30 obs., max. 3(5. .-.i, min. 32. 20 excep- 

 tionally 20.1'!.. 



Plankton-type. This species is, as is seen from the low sali- 

 nity, a neritic form, occurring along the coast of Africa. In March 

 and April it ai)peared suddenly between 40° — 50° N., from Newyork 

 to the north of the Azores and simultaneously in the English Channel. 

 After May it had almost completely disappeand from the Atlantic, but 

 in November it appeared again south of Nova Scotia — Xni. 



