KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 35. N:0 7. 25 



C. tripos NiTzscH. — January: whole Skagerak, rare to common. Fehruary: from 

 Newcastle to Sk. (max. N. of the Dogger Bank),- M. r to c, V. r. May: M. rr. April: 

 from 56° — 57° N. 4° E. to the West coast of Jutland, as a rule rare; the Skagerak ver)' 

 rare; M. rr. June: the Shetlands, more or less common; M. and V. cc. July — August: 

 the Shetlands c and common in the whole North Sea, from Scotland to S. Norway and 

 from the Scheldt to Sk.; M. and V. c. September: M. and V. cc. October: M. and V. cc. 

 November: round Scotland r; from the N. of the Dogger Bank to Skagerak c; Vinga cc; 

 M. and V. cc. December: M. and V. cc. 



Diiiophysis acuta Ebb. — January: central Skagerak r; west coast of Sweden r, 

 Gullmarsfjord c. February: from 58°— 59° N. 0° 30' E. to S. Norway; M. rr. March: 

 Kattegatt' r. April: not rare from 56° N. 3° E. and 55° N. 6° E. to Sk. May: M. r. 

 June: the Shetlands r, M. r. July — August: the Shetlands (50 — 10 m.); E. of Scotland 

 r; Sk. r: M. r. October: M. rr. November: sparingly in the area between 56° N. 1° E., 

 Holland, Sk. and S. Norway; V. r. December: M. and V. rr. 



D. Iiomunculiis Stein. — July: the Shetlands (200 — 50 m.) rr. 



D. rotimdata Stein. (D. Michaelis AuEiv.) — April: N. of Jutland r. May: M. r. 

 July — August: W. of Jutland -)-, M. r. November: rare in some spöts between Holland 

 and Sk.; V. rr. 



D. Vanhöitenii Ostf. {D. granulata Cl., D. acunnnatn and D. norvegica Clap. & 

 Lachm. Jörgensen). — January: Lysekil r. Ain-il: W. of Jutland r. July — August: 

 rare at the N.W. end of tho Dogger Bank and at 56°— 57° N. 5° E,; M. r. October: V. 

 rr. November: N.W. of Jutland r; V. r. December: V. rr. 



Diplopsalis lenticiila Bergh. — June: the Shetlands r. July — August: the Shetlands 

 (50 — 10 m.); E. of Newcastle; W. of Jutland; M. r. October: M. rr. November: sparingly 

 from the coast of Holland and from the Dogger Bank to Sk.; Vinga (30 m.) r; V. rr. 



Gronysiulax spiaifera Clap. & Lachm. — January: Dröbak (30 m.) r. April: between 

 Firth of Tay, Holland and Skagen. July — August: E. of Newcastle and W. of Jutland r. 

 October: V. rr. November: rare N. of the Dogger Bank and N. of Jutland. Decem- 

 ber: V. r. 



Peridiniiim depressum Boil. — .Jnnnary: central Skagerak r, Dröbak (30 m.) r. 

 February: rare in some spöts above the 100-raetre plateau of the North Sea. April: area 

 between 57° N. 3° E., Sk. and 56° N. 7° E., most common N.W. of Jutland; sparingly ofif 

 the Dutch coast; Skagerak r, M. rr, V. c. May: M. and V. -j-. June: the Shetlands r; 

 M. r. July — August: rather common W. of Scotland; rare off the Dutch coast. October: 

 V. and M. rr. November: W. of Scotland r; area between 56° N. 1° E., S. Norway and 

 W. Jutland; Vinga (30 m.) rr ; V. r. December: M. rr; V. -|- r. 



Peridinium divergens Ehb. — January: Dröbak (30 m. r). Febnmry: very rare at 

 58° N. 3°E. and W\ of Sk.; M. rr. May: V. c. July—Au.gust: N. of the Dogger Bank; 

 W. of Jutland to S. Norway, Skagerak r; The Shetlands (50 — 10 m.); M. and V. r. Sep- 



K. Sv. Vet. Akad. Handl. Band 35. N:o 7. 4 



