42 P. T. CLEVE, PLANKTON-RESEARCHES. 



Diatomacese. 



Actinocyclns Ehrenl)ergi Ralfs. — 1901 Fehruan/, Norw. 63°— G4° N. 1°— 6° E. ?■; 

 68° N. 13"— 14°E. c; 69° N. 16°— 17°E. + to r. March, Norw. 71°— 72°X. 22°— 24° E. 

 r to +. — Litoral. 



Gran's datn, probably the same as my A. Ralfsii W. Smith. 



Actinocyclns Ralfsii W. Smith. — 1901 November, W. of Schleswig and Jntlaiicl. 



1902 Februari/, from 56°— 58° N. 0° E. to S. Norway and W. Denniark, as a rule 

 sparingly. Skagerak sparingly and chiefly between 120 and 50 m. — Litoral. 



Ampliiprora hyperborea Grunow. — 1901 April, Norw. 69° N. 14° — 18° E. r. — A7/. 



Asterionella japonica Cleve. — 1901 November, W. and N. of Jvitland r. 



1902 Fehruary, off the coast of Holland, N. of Jutland r. V. oro. M. oro. Central 

 Gullmarfjord, 80 — 50 m. r. May, r W. of Scotland and at the Orkneys, c at 54°57' — 

 54°30'N.' 7°54'-7°46'E. — {Nm) Ns. 



Asteroniplialus heptactis Pialfs. — 1901 Fehruary, Norw. 63°— 64° N. 0°— 5° E. 



r. — S. 



Bacteriastrnm varians Lauder. — 1901 Januar-y, V. roo. August, ahnndant off 

 the mouth of the Elbe, thence sparingly to Holland and S. Jutland. November, W. and 

 N. of Jutland +. — Nm. 



Bacteriosira fragilis Gran. — 1901 April, Norw. 69° N. 14°— 18°E. + to r. — Ny. 



Bellerocliea mallens Brightwell. — 1901 November, off the mouth of the Scheldt +. 

 1902 Fehruary, from the mouth of the Scheldt to 55° N. 6°— 8° E. — Nm, or 

 rather litoral. 



Biddnlphia aurita Lykgrye. — 1901 Ja.nua:ry, V. oro. Fehruary, V. or +, Norw. 



69° N. 16° E. r. March, V. c + r. M. r. April,' Y . + 00. M. roo. ' Norw. 69° N. 14° 

 — 18° E. c to r. December, V. or +. M. orr. 



1902 January, V. r. M. r. Fehruary, 56° N. 5° E. and along the W. coast of 



Denmark, as a rule rare. Skagerak sparingly, but comraon along the whole west coast 



of Sweden, from Vinga to Vilderö. Mardi, V. rro. May, r W. of Scotland and at 54° 

 30' N. 7°54'E. — Ns. 



Biddulpliia mobilensis Bailey. — 1901 January, V. roo. M. or. Fehruary, V. oro, 

 Norw. 63° N. 5°— 6° E. + r; 68° N. 13°— 14° E. r; 69° N. 16° E. r. April, V. roo. Jane, 

 M. or. August, off' the mouth of the Elbe, sparingly. September, V. r. M. ror. Oetnher,, 



i 



