52 P. T. CLEVE, PLANKTON-RESEARCHES. 



Rliizosoleniii styliformis Beightwell. — 1901 Februari./, V. oro; Norw. 6.S'' — 64^ N. 

 1° — 5° E. r. August, coramon E. of Holstein-Schleswig, thence spanngly to ;ibout Liui- 

 fjord. Octoher, V. rro. November, area between 55° N. 0° E., 55° N. 8° E. and Skagen, 

 rare in the ^vest, cominon in the east. V. orc. December, V. + ro. M. 4- oo: R.So-. c. 

 Nh. c. 



1902 January, V. r. M. r. Februari/, from 56° N. 1° E. to the Elbe and Skagen 

 r, but common at 55° N. 3° E. Viiiga, 85 — 50 m. r. Along the coast of Sweden spa- 

 ringly in 160 — 25 m. J/ay, more or ]ess abundant in the area between 58° N. o°E., 

 56° N. 1°W.— 7°E. and Skagen. M. roo. V. oor. June. V. r. — S. 



Rhizosolenia obtnsa Hensen. — 1901 May, Atl. 62°— 64° N. 1° E.— 5° W. + c. —T. 



Skeletonenia costatum Greville. — 1901 Januari/, V. + + o. February, V. oor\ 

 Norw. 63° N. 5° E. r. March, V. r + +. Ajml, M. r + o^Norw. 69° N. 14°— 18° E. c to +. 

 May, Atl. 63° N. 3° W. October, V. r + r. M. oor. November, N. of Skagen, very abundant. 

 V. c + r. M. c. December, V. + or. M. r + +. 



1902 January, V. r. M. r. February, N. of Jutlaiid. N. of Skagen +. Coast of 

 Sweden and in the fjords c. March, V. + re. M. ccc. April, M. er. V. cro. May, 

 Orkneys r. — A^.s-. 



Stephanopyxis turris Greville. — 1901 February, Norw. 63° N. 4° E. +. Aiiril, V. 

 roo. August, Vinga in 40 — 50 m. r. October, V. oor. November, area. between Firth 

 of Forth, 54° N. 9° E. and Skagen, as a rule sparingly, rarest in the west. V. rrr. M. r. 

 December, V. rrr. M. r + o. R.Sg. +. Nh. r. 



1902 January, M. r. February, N. of Jutland r. Off Väderö ■;■. May, r at 56° N. 

 2° E. and N. of Jutland. — Nra. ' • 



Stveptotheca thamesis Sheubsole. — 1901 November, W . of Jutland r. — Nm. 



Thalassiosira gelatinosa Hensen. — 1901 February, Norw. 63° N. 5° E. r. March, 

 V. oro. May, Atl. 63° M. 3° W. r. October, M. oor. November, W. of Jutland r. V. roo. 

 December, V. ror. M. ror. li.Sg. r. 



1902 January, V. r. M. r. February, sparingly at 55°— 56° N. 0° E.— 2° W., S.W. 

 of Norway, W. of Jutland. Along the coast and in the fjords of Sweden r to c. March, 

 V. oro. April, V. roo. — Ns. 



Thalassiosira gravida Cleve. — 1901 April, V. rro. M. oro. Norw. 69° N. 14° — 

 18° E. +. May, Atl. 62° N. 1° E. to 64° N. 5° W. c + c. November, sparingly in the 

 area between 57° N. 5° E. and the west coast of Deninark, common off the coast of Hol- 

 land. V. oro. December, V. oor. M. ?'?"r. R.Sg. r. Nh. r. 



1902 January, V. r. M. +. February, 57° N. 4° E. and N. of Jutland r. N. of 

 Skagen c. Along the coast and especially in the fjords c. March, V. + oo. M. orr. 

 May, W. of Scotland, the Orkneys and at 56° — 57° N. 1° — 3° E., rare to common. — Ns. 



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