.) I DIATOMACK.l', — (;H/1',T()CER0S 



Jdly. ()1 N. 2)V W., not rare. 

 IS'.H) Maij: ()2 N. 2 E.; (il N. l"" K., rare; 1)5 N. 1 W., rare. 



Temperature: ii..., mean of 6 oh.s., max. 15, min. .">. 



Salinity: Sl.dn, mean of 5 obs., max. H5..-,i, min. 32.51;. 



Plankton-type. This species is not oceanic. Tiie occurrence 

 west of tlie tropical Africa is very remarkable, as it else occurs north 

 and south of Iceland and in the winter plankton of the Skagerak. 

 LEMMERjrAxx mentions it from the northern Pacific. - A'.s. 



CH.ffiTOCEROS SKELETON Scni tt.^ 



(Cl. a Treatise on the Phyto-plankton PI. 11 fig. 3. 



1898 Janaary: 44—46^ N. 17—11° W.; ~r N. 5.4^ \V. 



Marrli: 1° S. 15' W.; area between the Azores, 4;')^ N. lo" 



W. and 49^ N. 18" W. 

 Apiil: 48°— 50-' N. 29°— 8" W.; 10- N. 53- \\ 

 Maij: 48- N. 25" W.; 50° N. 14° W.; 57' N. 28- W to'59 N. 



15° W. 

 June: 63° N. 19' W. 

 July: 60° N. 23° W. to 61° N. 8- \V 

 ■ August: Azores; 63° N. 25° W. to 65' N. .".3- W 

 September^: Azores; Denmark's Sound. 

 fJctobcr: 59" N. 16° W. and 60° N. 4' W. 



Temperature: 15.4, mean of 24 obs., max. 26. i, min 11. 



Salinity: 35. ei, mean of 19 obs., max. 36. js, min. 35. u. 



Plankton-type. The salinity and temperature prove that this 

 species is an oceanic form of the Styli-type. It occurs chiefly in the 

 eastern Atlantic, having once only been seen in the west, north of 

 South America. In March and April it occurred between the Azores 

 and the Engl. Channel, had is May advanced north of Rockall, in 

 June to the south coast af Iceland, whence it in August drifted 

 towards Greenland and the Shetlands. It occurs in the Indian 

 Ocean. — N. 



' Ostenfeld's data used. 



