34cS DIATO.MACKvK — RHIZOSOLKXIA 



ISU9 Jfoniavij: Fiiroes, rare. 

 Maij: 58° N. 3" E., rare. 

 Xoreiiibcr: 51° N. 13° W., rare. 



Temperature: 12. n, mean of 24 ol).>^., ina.x. 2U.i, min. 7.,s. 



Salinity: 35. oi, mean of 17 obs., max. 35..i4, min. 33. 35. 



Plankton-type. This form has been found in the Mediterra- 

 nean, the Indian Ocean and at Jedo Bay (Japan). It occurs in the 

 AHantic rarely or in scattered specimens only, but during the spring 

 and summer gregariously in the Kngl. Channel and southern North 

 Sea. It is thus a neritic form, which belongs to the eastern coasts, 

 as it has been seen once only in the Florida flurrent. As many 

 other species of the southern bank-water it was in the winter seen 

 in the Cape Verde region and in the spring betw^een the Azores and 

 tlie Engl. Channel. — Xin. 



RHIZOSOLENIA STOLTERFOTHII Pekaciallo.^ 



(Le Diatomiste 1892 PI. Xlli liij. 17—18). 



lSi)8 .huuKirii: 12^ N. 1*.)- W.; 20° N. 18^ W. 



March: 21° N. 18° W.; 41^ N. H6° W. to 45° N. 36° W. 

 Api-il: Azores; 48° N. 8° \V.; Kngl. Channel; 47° N. 40° W. 

 May: 59°— 60° N. 15^— 13° W.; 45° N. 43° W.; 42^ N. 6t°— 



65° W., everywhere rare. 

 Jiuw: 10° N. 53" W., rare. 

 July: 59°— 62° N. 6°— 0° W., rare. 

 Auyuxt: <)0° N. 2°— 3° W.; 64° N. 27° W. 

 Si'ptcjiibcr: Shetlands, common. 

 Ocfohc/': (Orkneys and Shetlands, rare; 41° N. 59° — 67° W., 



nol common. 

 Xorcn/her: 47° iN. 41 W.; 43 N. 61° W.; 42° N. 64^ AV., 



everywhere rare. 

 Di't-i'inhi'i-: 18° N. 67° W., rare. 

 1S99 March: 47° x\. 8° W., rare. 

 May: 59' N. 2' E., very rare. 



OstenfohTs data used. 



