KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 35. N:0 7. 31 



Dactyliosolen antarcticus Castr. — Jicne and July: the Shetlaiids. November: 58° — 

 59° N. 0°E. rr. 



Ditylum Brightwellii West. — January: central Skagerak v. April: 57° N. 5° E. r. 



Octoher: M. r, V. -\- r. November: more or less common from Holland to Sk.; Vinga 

 (30 m.) r; M. r, V. + r. December: M. and V. r. 



Eucampia zodiacus Ehb. — April: sparingl}' in the area 56° — 57° N. 4° E. and 54° 



— 55° N. 5° — 6° E.; North of Jutland r. Octoher: M. and V. c. November: more or less 

 common from Holland to Sk.; S. of Norway r, Vinga (30 in.) c, M. c, V. -|- r. Decem- 

 ber: V. r -\-. 



Guinardia flaecida Castij. — January: V. r. Fehruary: 57° N. 8° E. r.; M. ■;■/•. April: 

 more or less common in the area 56° — 57° N. 5° — 7° E.; N. of Holland v. June: the 

 Shetlands r, V. r. July — August: W. of Jutland, M. c to v, V. r. October: M. and V. 

 -|-. November: more or less common from Holland to the W. of Jutland, M. r, V. -|- r. 

 December: M. r, V. -|- r. 



Lauderia aumilata Cl. {L. horealis Gran.) — April: central North Sea, 56° — 57° N. 

 2° — 6° E. June: the Shetlands r. October: V. -|-. November: N. of Jutland r, V. r. 

 December: V. r. 



Leptocyliiidrus danicns Cl. — Fehruary: V. +. April: 57° N. 3° E. rr, Sk. rr. 



May: M. -|-. June: V. r. July — August: W. of Limfjord r. November: W. of Limfjord. 

 December: V. r. 



Nitzsehia lineola Cl. — July: the Shetlands r. 



N. seriata Cl. {N. fraudulenta Cl.). — March: M. r, V. -|-. 



Rhizosolenia alata Bktw. — June: the Shetlands r. November: W. and E. of Scot- 

 land r. 



R. ealcar avis Sciiulze. — January: Vinga r. July — August: W. of Limfjord r. 

 September: M. -|-. October: M. and V. -f-. November: N. of Jutland, Vinga (30 m.) c, 

 M. r, V. c. December: M. r, V. -\- r. 



R. delicatnla Cl. — November: Väderöboda 



rr. 



R. (alata var.) gracillima Cl. — Ajml: 57° N. 4° E. r. May: M. r. ' June: the 

 Shetlands c, M. and V. c. July — August: cc in the western Skagerak; M. and V. ccc to 

 -|-. September: M. -|-. October: M. r, V. -|-. November: W. of Scotland and N. of Jut- 

 land r, Vinga (30 m.) r, V. -f . 



R. seinispina Hensen. — January: V. ;•. Fehruary: M. and V. -j-. March: at 

 56°33'N. 12°16'E. c, Vinga and M. + c. April: in the area between 56°— 57° N. 2° E. 



