;MH DIATOMACKJ., — RHIZO.SOI.KMA 



1S1I9 JnniKii'n: l^iuiies, rare. 

 Ma;i: 58° N. 3° E., raiv. 

 Xiircinbcr: 51° N. 13^ W., rare. 



Temperature: 12.6, mean of 24 obs., max. 20.i, min. 7.n, 

 Salinity: 35.oi, mean of 17 obs., max. 35..^i, min. 33.s6. 

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

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

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

 and summer gregariously in the Engl. Channel and southern North 

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

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

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

 in the Cape Verde region and in the spring between the Azores and 

 the Engl. Channel. — Xm. 



RHIZOSOLENIA STOLTERFOTHII Peragallo.' 

 ,Le Diatomiste 1892 PI. XIII fig. 17—18). 



181)8 .Jaiuiunj: 12" N. 19° W.; 20° N. 18° W. 



March: 21° N. 18" W.; 41° .N. 66° W. to 45' N. 36' W. 



April: Azores; 48' N. 8' W'.; Engl. Channel; 47' N. 4<J' W. 



May: 59°— 60° N. 15'— 13' W.; 45' N. 43^ W.; 42' N. 61 — 

 65° W., everywhere rare. 



■JariL': 10° N. 53' W., rare. 



Jidij: 59°— 62° N. 6°— (r W., rare. 



A//ry«.sf; 60' N. 2'— 3' W.; 64' N. 27' W. 



September: Shetlands, common. 



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

 not common. 



Xoreinber: 47 N. 41° W.; 1-3' xN. 61° W.; 42' N. 64' W., 

 everywhere rare. 



Deeeinber: 18° N, 67' W., rare. 

 1899 March: 47° N. 8° W., rare. 



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



Osteafeld's data used. 



