ÖFVERSIGT AF K. VBTENSK.-AKAD. FÖRHANDLINaAR 1899, N:0 8. 791 



Ju ne. From 68 N. 13^ E. to the NW. of Iceland and 

 into the Sound of Danmark. — S. of Iceland, SW. of the Färöes, 

 W. of the Shetlands to 62' N. 2%30' E. — Between Norway 

 and Beeren Island (74= N. 23"^ E.). — At 57° N. 34° W. — 

 Davis Strait (63° N. 56^ W. and 66° N. 55° W.). 



July. At 63° N. 14° W., 61' N. 8° W. and 60° N. 

 23° W. 



August. North of the Färöes. Färöe Channel. Spitzbergen, 

 from 77° N. 9° E. to 78= N. 12= E. — At 65° N. 33° E. — West 

 of Greenland (69° N. 53° W.). Everywhere rare. 



September. N., S. and SW. of Iceland. The Färöes to the 

 Shetlands. S. of Spitzbergen to Beeren Island. — Davis Strait, 

 from 59° N. 50° W. to 65° N. 55° W. Everywhere rare. 



O et o ber. Rare S. of Iceland, W. of the Färöes, N. of 

 Scotland, S. W. of the Shetlands and NNW. of Rockall. 



November, xilong the south coast of Iceland to W. and 

 S. of the Färöes and from thence to the Shetlands. Not rare 

 at 56° N. 30° W. and 51° N. 20° W., rare at 45° N. 50° W. 



December. S. and SW. of the Färöes. — From 47° N. 

 45° W. to 41° N. 66' W., usually rare. 



This species follows the same routes as all the above species, 

 but it does not proceed so far to the south during the winter. 

 It has not, for instance, been seen on the area round the Azores; 

 but there occurs a Chcetoceros, which I have named C. atlanticus 

 v. exigua] it diifers from the type by its very small size, so 

 that it seems to be a dwarf-form. This form has been found in 

 1898 at the foUowing places. 



January. At 44° N. 17= W. 



March. Between 45° N. 13° W. and 30° N. 35° W. 



April. At 49° N. 19' W. Between 50° N. 9° W. and 

 48° N. 29° W. 



June. At 49° N. 17' W. 



November. The Azores and at 56' N. 23° W. 



This form was not seen in May and from July to October. 

 — The distribution of this diatom gives a strong support to 



