KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 36. N:o 8. 35 



Xaiitliidium hystrix Cleve. — 1901 January, V. roo. February, V. oor. April, M. 

 roo. May, V. rrr. M. r +. August, N. Skagerak r, M. roo, sparingly along the west 

 coast of Denmark and S. E. of Dogger bank. September, V. r. October, V. roo. M. orr. 

 November, 57° N. 5° E., W. and N. of Jutland, r. V. oro. December, V. oor. 



1902 February, N. of Jutland r; off Väderöboda 50 — 25 m. r. April, V. orr. May, 

 r at 58° N. 8° E. and 56° N. 0°37' E. June, V. oor. July, M. roo. The fjords r. — Tp. 



Xanthidinm imiltispinosum Möbius. — 1901 January, V. roo. April, M. roo. August, 

 Skagerak 58°20' N. 10° E. r, M. r. W. of Scotland r, E. of Firtb of Forth r, W. of Den- 

 mark r. September, V. r. October, M. oor. November, 56° — 58° N. 1° — 7° E. r. V. oor. 

 December, V. roo. 



1902 February, off Väderöboda, 70—50 ra. r. May, very rare at 57°29' N. 9°21' 

 E. — Tp. 



Flagellatae. 



Dinobryum pelliicidum Levandek. — 1901 January, V. oro. April, V. o + r. M. 

 o + r. May, M. roo. 



1902 March, M. oor. ^prf/, M. c +. V. c + o. May, M. + ro. V. oro. — iYs. 



PhiBocystis Pouclieti Hakiot. — 1901 April, Norw. 69° N. 14°— 18°E. c +. May, 

 Atl. 62° N. 1°E. c. 



1902 May, abundantJy at 56°30' N. 0°30 — 3°47' E. and sparingly at 53°26' N- 4°35' 

 E. — T {Ns.). 



Dinoflagellatae. 



Ceratium arcticum Ehrenberg. — 1901 February, Norw. 63° — 64° N. 0° — 4° E. c 



to r, *) 70° N. 10° E. r. Mardi, Norw. 71°— 74°N. 16°— 24°E. c, r. ITrty, Atl. area 62° 

 N. 0°W., 65° N. 6°W. and 68° N. 18° E., cominon in the N.W., rarer in the south and 

 west. — T. 



Ceratium Imceplialum Cleve. — 1901 January, V. + rr. M. or. February, V. roo. 

 Norw. 63° N. 5° E. c +; 68°— 69° N. 17°— 13°E. c;' 70° N. 10° E. r. Mardi, Norw. 71° 

 — 74°N. 16°— 24°E. c to r. April, Norw. 69° N. 14°— 18° E. +. i%, Atl. 68° N. 6°— 

 13° E. r to +. August, r N.E. of Scotland; central Skagerak to Vinga and M. spai-ingly. 

 September, V. r. October, V. rrr. M. orr. November, sparingly in the whole northern 

 North Sea (north of the banks). V. rrr. December, V. o + r. M. rro. R.Sg. )•. Nh. r. 



1902 January, V. r. M. r. February, sparingly in the area 56°— 58° N. 0° E., S. 

 Norway and S. Jutland. Skagerak eveiywhere, but sparingly. May, r at 58° N. 6° E. 

 and 56° N. 2° E. July, V. orr. — S, Tp. 



*) Common at 0°, rarer near the coast. The Ceratia which form the ^ripos-planktou were, on the 

 contrary, more common near the coast. 



