202 



E. Jorgensen. 



b. Ardissonia (De Not.) V. H. 



S. crystallina (Ao.) Kutz. 

 Kutz. Bacill. p. 69, pi. 16. f. I. Van Heuhck Synops. pi. 42. f. 10. Diatoma c. 



AG. Consp., ]>. 52. 



Not unfrequent: Stamsund r. Svolvser -|-, Gaukvtero r, 

 Stone r. 



Distribution: Coasts of Western Europe. The Mediterranean. 

 Finraark. 



S. superba Kutz. 

 Kutz. Bacill. p. 69, pi. 15, f. 13. Van Heurck Traite d. Diat., p. 316, pi. 30, f. 834. 



Very rare: Ostnesfiord r, Stene r. 



Distribution: Coasts of Western Europe. The Mediterranean. 

 Finmark (var. minor Grun.). 



S. bacillus Gbeg. 

 ■Greg. Trans. Micr. Soc. 1867, p. 88, pi. 1. f. 54. Van Heueck Synopsis pi. 42, f. 9. 



Very rare: Svolvser r. 



Distribution: Coasts of Scotland and Ireland. 



c. Toxarium (Bail.) V. H. 



S. undulata (Bail.) W. Svt 

 W. Sm. Brit Diat. II, p. 97. Van Heueck Synops. p. 154, pi. 42, f. 2. To.r- 

 arium undidatum Bail. Notes on new sp. and loc. of Micr. Org. p. 15, figs. 24 — 25. 



Not unfrequent: Stamsund r, Svolvfer -)-, 0stnesfiord r+, 

 Gaukvrero r. 



Distribution : Coasts of Europe and North America. Red Sea. 



S. Hennedrana Greg. 



■Geeg. Diat. of Clyde p. 532, pi. XIV, f. 108. Van Heueck Synops. pi. 42, f. 3. 



Very rare : Stamsund r. 400 |i long. 



Distribution: Coasts of Scotland and Belgium. The Mediter- 

 ranean. 



S. (hvperhorea var.?) rostellata Grun. 



Gecn. Diat. Frnnz Jos. Land p. 54, pi. IT, fins. 6 a — b. 



A specimen very similar to the figure referred to was found: 

 Gaukvsero. 38 |* x 3 |).. Striae very fine. 

 Distribution: Franz Josef's Land. 



Tlialassiotlu-iv nitzschioides Grun. 



Cf. above p. 102. 



Derived from the plankton. 



Very rare: Stamsund r. Gaukvrero r. 



Distribution: Cf. above p. 102. 



Se«'|»troiH'i!«; Ehrb. 



S. marina (Greg.) Grun. 



Grin, in Van Heueck Synops., id. 37, f. 2. Meridion marinum Greg. Diat. of 



Clyde- p. 497, pi. X, f. 41. 



Not unfrequent: Stamsund r -)-, Raftsund r. Ostnesfiord r, 

 Gaukvsero r. Stene r. 



Distribution: ('oasts of the North Sea. Finmark. Balearic 

 [sles. 



S. kamtschatica Grun.? 

 Geun. in Van Heueck Synops. pi. 37, f. 6. 



A species very similar to the figure mentioned occurred in the 

 sample from Stene, r (several specimens i. Usually broader than 

 the preceding, somewhat variable in shape, at the broader end 

 sometimes rounded, sometimes only obtuse. Valve distinctly costate 

 with linear pseudoraphe; costse somewhat radiating, 6 — Q l / 2 on 10 \i. 

 Length 38—40 |i, breadth 7—8 |i. Also similar to Opephora paei- 

 fica Geun. in V.H. Synops. pi. 44. f. 22. 



Distribution: Kamtschatka. Opephora pacifica, perhaps the 

 same species, in the North Pacific. 



Rtiaphont'is Eheb. 



R. nitida (Greg.) Geun. 

 Cocconeis n. Geeg. Diat. of Clyde, p. 492, pi. IX, f. 26. Geun. Alg. No vara p. 99. 



Rare : Stamsund r +. 



Distribution: Coasts of the North Sea. The Mediterranean. 

 Auckland. 



S. Plagiogrammeie. 



I'laji'ion'i annua staurophorum (Geeg.) Heib. 

 Heib. Consp. Diat. Dan. p. 55. P. Gregorianum Grev., Van Heurck Synops. 

 p. 145, pi. 36. f. 2. Denticula staurophora Greg. Diat. of Clyde p. 496, 



pi. X. f. 37. 



Frequent: Stamsund r, Svolvser r, Raftsund r, Ostnesfiord r, 

 Gaukvaero -f-, Stene +• 



Distribution: Coasts of the North Sea and Western Europe. 

 Finmark: Greenland. South America. Cevlon. 



Dim* r< 'gramma Ralfs. 



D. minus (Geeg.) Balfs. 



Balfs in PaiTCH. Inf. p. 790. Van Heueck Synops. pi. 36, f. 10, 11 a. 



Denticula m. Greg. Diat. of Clyde p. 496, pi. X, f. 35. 



Somewhat rare: Stamsund r, Svolvser r, Gaukvsero r, Stene r + . 



Tar. nana (Greg.) V.H. 

 Van Heurck Traite p. 336, pi. 10. f. 393. Denticula nana Greg. 1. c. f. 34. 



Rare : Gaukvsero r. Seems to be only a smaller form of the 

 preceding species. 



Distribution: Coasts of Western Europe. The Mediterranean. 



D. tulYiim (Greg.) Balfs. 



Balfs 1. c. Denticula fulva Greg. Diat. of Clyde, p. 496, pi. X, f. 38. Van 



Heurck Synops. pi. 36, f. 28. 



Somewhat rare: Stamsund +, Gaukvaero -\-, Stene r. 

 Distribution: Coasts of Western Europe. Sweden. The Me- 

 diterranean. 



4« i y photic Mini* Grev. 



G. Williainsonii (Greg.) Grun. 



Cf. above p. 102. 



Rather frequent: Moskenstrommen r, Stamsund -\-e, Gauk- 

 vaero r, Stene r. 



